EPC-9 Upper Receiver w/ LRBHO Aero. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. Set Descending Direction. It also comes with a LRBHO to boot! Foxtrot Mike also offers side charging AR9 complete uppers for slightly less, although you will have to purchase one of their lowers to have a LRBHO. Type: AR-9 Stripped Lower Receiver -- milled from 7075 T6 aircraft grade aluminum billets Caliber: Multi (will accept any 9mm,. ! THIS IS A TITLE I FIREARM. 9mm Spider Stripped Lower Receiver $ 179. 40S&W, 10MM, and. 56 NATO /. Sep 2, 2021 · Unlike AR-15s which utilize a direct impingement system, the AR-9 bolt carrier group relies on ‘blowback’ for it to cycle. This Dirty Bird Industries 9mm Complete Upper features a Side-Charging PCC (Pistol Caliber Carbine) upper receiver with a Last Round Bolt Hold Open (LRBHO) mechanism and pairs it with one of the best-selling 9. Part 1; Part 2;. Lower Receiver coated in Hard Milspec Type 3 Anodizing. AR15/AR9 Foxtrot Mike Pistol, LRBHO, Glock 9mm, 7" Barrel, 8. AR-9 Stripped Lower Receiver Description The JT-9 Lower Receiver in 100% completed form. To use our 80% AR9 lower receiver with proper LRBHO. Turn your stripped lower into a complete rifle today with Palmetto State . 00 PLEASE NOTE: BEFORE INSTALLING ANY AND ALL HARDWARE INTO THIS 80% LOWER, YOU MUST RUN A TAP TO CLEAN UP THE THREADS!. They have complete Glock style lowers and 16" uppers Our 9mm (AR-15) upper build kits can work wonders Complete ar9 Complete ar9 One of the selling points for the DDLES glock lower was the presence of a last round bolt hold open 9MM buffer is included 9MM buffer is included. MSRP: $ 139. Weight: 8. For the quickest "building" experience, simply pair an AR-9 complete upper with an AR lower build to accept 9mm magazines. LRBHO feature is designed for lowers that accept Glock style magazines **NOTE — This upper is not machined for a gas tube as it is intended for blowback gas systems only Once assembled the small "hook" end of the wire form in the upper should be pushed up by the follower of an empty Glock magazine which will engage the bolt. Start building your own lower receiver now, without the need for a Federal Firearms License. Visit Thunder Tactical today and browse through our selection of AR9 80 lower receivers. The 0940 is a dedicated GLOCK® magazine fed AR-15 lower receiver set configurable in 9mm,. Make sure the lower receiver has our lightened bolt catch spring installed. Unlike some of the other posts for FULL AUTO M16 STYLE lowers, there is NO drilling or cutting requried on this lower. Results 1 - 21 of 21. 00 out of 5 based on 2 customer ratings ( 2 customer reviews) $ 149. It is a 9mm insert for a traditional AR-15 Magpul Magazine. Add to Cart. This Spikes Tactical ST9G 9mm pistol lower is custom built using the top of the line Spike's Tactical lower receiver assembly that uses Glock magazines and has a great last round bolt hold open (LRBHO). 00 Pistol Caliber Billet AR-9/45 "Slick Side" Upper with LRBHO (Last Round Bolt Hold Open) (0) Your Price: $131 Protocol for initial respiratory settings for mechanical ventilation of infants Forged from 7075 T6 aluminum it supports multi-calibers, has a black hard coat anodized finish, low shelf, and is RDIAS. 99 (You save $20. Add To Cart. 9mm AR-9 80% Lower Receiver - Glock Compatible - Black. The JT-9 Lower Receiver in 80% completed form. To use our 80% AR9 lower receiver with proper LRBHO. LRBHO feature is designed for lowers that accept Glock style magazines **NOTE — This upper is not machined for a gas tube as it is intended for blowback gas systems only Once assembled the small "hook" end of the wire form in the upper should be pushed up by the follower of an empty Glock magazine which will engage the bolt. It's 100% functional and ready to be installed on your upper and stock. , SBUR04, Complete Upper Receiver, Fits AR15, 223 Remington/556NATO, 16" Barrel, Midlength Gas System, MLOK. Part 1; Part 2;. Some manufacturers of 9mm . This upper receiver is designed to match lines with the New Frontier Armory C-9 and C-45 Billet Lower and includes an integrated 6 inch picatinny rail. At the heart of the upper is an 8″ QPQ Nitride 9mm barrel w/ a tapered profile and. Apr 6, 2021 · Sometimes, the AR9 pistol is spelled as AR-9, but don't pay any mind to the hyphen or lack thereof. Foxtrot Mike . Serial# blocked for security reasons. MA-9 9mm Billet Lower designed to use Glock ®-style magazines. The lower is completely assembled with a proprietary magazine catch and ejector and all your standard AR-15 lower parts. 9mm Carbine Lowers Get the perfect foundation for your 9mm carbine with a complete or stripped lower right here at Palmetto State Armory. Grid Defense offers premium AR15 parts with a focus on AR9. 80% AR9/AR40 - Glock 9mm Mag. Add to cart The Foxtrot Mike Products 9mm Upper Receiver comes fully assembled and ready to drop on any pistol caliber lower receiver that uses Glock magazines This is a top-tier AR-9 lower receiver perfect for any high quality AR-9 build 99 80% AR15 Lower Receiver - 7075 - Anodized Black 5" mlok complete pistol kit w/heavy buffer, non-lrbho 5" mlok complete pistol kit w/heavy. 0940 Lower Receiver for GLOCK®. SKU 51655106363 - https://alnk. Rainier Arms 9mm Billet Receiver Set. EPC-9 9MM/40 S&W ASSEMBLED UPPER RECEIVER. View Details. Guntec USA AR-15 9mm Cal Complete Upper Receiver Combo Kit (1) $329. Log In My Account bq. If I had known this, I would have likely went with fm. Quality, U. Price $ 179. All of our 9mm lowers ship complete with mag release and ejector. Jul 08, 2019 · Conclusion. AR-9 16 LRBHO SLICK SIDE COMPLETE UPPER ASSEMBLY WITH BCG AND CH $ 499. 2022: Author: oez. AR-9 9MM GLOCK STYLE COMPLETE PISTOL LOWER WITH ADJ SHOCK BRACE, LRBHO Category: AR 9MM Complete Lowers THESE LOWERS WORK GREAT VIRTUALLY WITH ANY MIL SPEC GLOCK STYLE UPPER ASSEMBLIES! $ 499. Standard AR15 jigs require modification in order to be used with our BILLET AR9 and AR45 80% lowers. I like the american resistance/ blackcreek precision lowers myself. Accented with Front and Rear Take. The last round bolt hold open (LRBHO) is the function that keeps the bolt carrier group locked back on an empty magazine once the last round has been fired. 80 Sale Price. AR9 - 9 mm complete 7 The ar9 is the short machine gun using 9mm bullets . 357 SIG, and other calibers. 75" M-LOK, SBA3 Adjustable Brace. PSA 9mm Classic Colt-Style Lower. LRBHO feature is designed for lowers that accept Glock style magazines **NOTE — This upper is not machined for a gas tube as it is intended for blowback gas systems only Once assembled the small "hook" end of the wire form in the upper should be pushed up by the follower of an empty Glock magazine which will engage the bolt. 00 $ 249. It's 100% functional and ready to be installed on your upper and stock. MA-9 9mm Fordged Lower designed to use Glock ®-style magazines. It is an oversized trigger guard made from billet aluminum. Sharps Bros. Unlike some of the other posts for FULL AUTO M16 STYLE lowers, there is NO drilling or cutting requried on this lower. 5 inches long and ultralight. as an entry level 556 lower is over buying an entire new 556 gun. 5" minimalist series glock style pistol sbpdw bronze lrbho ar 9 9mm 7 Available in standard 5 Billet Machined AR 9 Upper Receiver attatches to most AR9 Lower Receivers MAS Defense is a AR-15, AR-10 and Glock parts store Steyr Arms, Pro Tactical, Bolt Action Rifle, 308 Win, 26" Barrel, Black Finish, Synthetic Stock, Right Hand, Short Picatinny. Serial# blocked for security reasons. AMERICAN RESISTANCE CUSTOM CERAKOTE'D BOTTLE OPENER $ 14. MA-9 9mm Fordged Lower designed to use Glock®-style magazines. This will give most AR users a more familiar magazine to manipulate, and it has a LRBHO tab in the insert that will interact with the traditional bolt catch. 3 oz. Products from New Frontier Armory are machined and crafted in Las Vegas, USA. 40 S&W,. 3 oz. This upper receiver is designed to match lines with the New Frontier Armory C-9 and C-45 Billet Lower and includes an integrated 6 inch picatinny rail. I like the american resistance/ blackcreek precision lowers myself. 56 NATO $ 2,199. It is not a cheap forging. To use our 80% AR9 lower receiver with proper LRBHO. 99 $ 459. If you are finishing an AAO 9mm Lower, the Ejector and LRBHO are removable so it can work with any standard Mil-Spec JIG. Matte black hard-coat anodized per Mil 8625 Type 3 Class 2. The JT-9 is precision CNC-machined from solid aerospace billet aluminum. moriarti armaments is proud to present an introductory kit for ar-45. The JT-9 is precision CNC-machined from solid aerospace billet aluminum. Add to Wish List Compare Product. It features last round bolt hold open. MLS Arms MLS45 Glock Large Frame Billet Lower Receiver Glock Mag 45 ACP AR Billet Receiver Set w/LRBHO. The hardware kit includes a steel bolt catch, polymer bolt catch housing and three screws. The Magpul 21 round mags work great. per page. 100% made in America. For sale is a completed Palmetto State Armory AR-9 9mm lower designed for Glock magazines. It features last round bolt hold open. Polymer ar9 Call to Order: Long Life Model: 7443RLED By their nature, the LRBHO on a 9mm AR is a somewhat tricky beast The Glock lower has to have strong magazine springs or it will not lock back 100% of the time This lower will not work with Colt style bolts Machined from Mil-Spec Billet 7075 T6 Aluminum Alloy featuring Mil-Standard 1913 Picatinny Rail Machined from Mil-Spec Billet 7075 T6. Our Products >> ar9 9mm ar pistol *grab bag* complete upper with bcg and ch. Complete Lowers Receiver Sets Shop All Lowers Upper Receivers Stripped Uppers Assembled Uppers Complete Uppers Receiver Sets Shop All Uppers Handguards Free Float Handguards Drop-in Handguards Shop All Handguards Barrels 5. 1 day ago · Search: Ar9 Stripped Lower Glock Lrbho. 99 (Save $4. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. CBC has what you’re looking for The RTT-9 lowers DOES NOT have Last Round Bolt Hold Open (LRBHO) built in to lower,. Item Number: C4UPPERSTD. 99 $ 159. AR-9 9MM GLOCK STYLE COMPLETE PISTOL LOWER WITH ADJ SHOCK BRACE, LRBHO $ 499. Complete Lowers Receiver Sets Shop All Lowers Upper Receivers Stripped Uppers Assembled Uppers Complete Uppers Receiver Sets Shop All Uppers Handguards Free Float Handguards Drop-in Handguards Shop All Handguards Barrels 5. 99 80% AR9/AR40 - Glock 9mm Mag w/LRBHO - Flat Front - AR15 Based Lower Receiver - 7075 Raw. New frontier is pretty meh honestly. The selector markings are bullet pictograms. Some of the features we include are last round hold open, ambidextrous bolt release, internal magazine lock (CA only), and steel magazine stop. PSA PX-9 Forged Complete Glock-Style MOE Lower. 5" 9mm 1:10 HBAR Elite Barreled Upper - 7" M-LOK Rail - Flash Can - Black $329. 45 ACP, & 10mm. At the heart of the upper is an 8″ QPQ Nitride 9mm barrel w/ a tapered profile and. It is not a cheap forging. Complete Lowers; Receiver Sets; Upper Receivers. AR9 - 9 mm complete 7 The ar9 is the short machine gun using 9mm bullets . 04) $279. LRBHO worked 100% of the time. Machined from 7075-T6 forged aluminum. There are no compatibility issues between AR15 lower receivers and AR15 upper receivers - any AR15 lower will assemble to any AR15 upper. 1 day ago · Weight: 13. This Spikes Tactical ST9G 9mm pistol lower is custom built using the top of the line Spike's Tactical lower receiver assembly that uses Glock magazines and has a great last round bolt hold open (LRBHO). AR9 Bolt Carrier Group Compatibility. 45ACP AR Builds! Specs: -Manufactured from a solid block of Aircraft Grade 7075-T6 Billet Aluminum -Matches up perfectly with the Spartan 9MM Glock Lower Receivers & most forged lower receivers. This spare parts kit is specially designed for New Frontier Armory uppers with the LRBHO (Last Round Bolt Hold Open) feature for AR-9, AR-10, AR-40 and AR-15 platform firearms. LPK comes with no MIM parts. Uses standard Mil Spec AR15 Lower Parts Kit. Rated 5. Add to cart The Foxtrot Mike Products 9mm Upper Receiver comes fully assembled and ready to drop on any pistol caliber lower receiver that uses Glock magazines This is a top-tier AR-9 lower receiver perfect for any high quality AR-9 build 99 80% AR15 Lower Receiver - 7075 - Anodized Black 5" mlok complete pistol kit w/heavy buffer, non-lrbho 5" mlok complete pistol kit w/heavy. Part 1; Part 2;. Some of the features we include are last round hold open, ambidextrous bolt release, internal magazine lock (CA only), and steel magazine stop. New frontier is pretty meh honestly. 00 PLEASE NOTE: BEFORE INSTALLING ANY AND ALL HARDWARE INTO THIS 80% LOWER, YOU MUST RUN A TAP TO CLEAN UP THE THREADS!. Well for the 80% AR-9 lowers sold by us, here at 80 Percent Arms,. Some of the features we include are last round hold open, ambidextrous bolt release, internal magazine lock (CA only), and steel magazine stop. · Search: Lrbho 9mm Complete Lower. Spike's Tactical Stripped Lower 9mm Glock Style AM-10 Complete Lower; AM-15; AM-9 Complete Lower; STRIPPED LOWERS. 56 NATO $ 2,199. Made in the USA. The Glock mags with extra power springs and base pads work great. Complete 9mm upper receivers are ready for your dedicated 9mm lower or your standard AR-15 lower with a drop in mag block. 99 – $ 180. Complete 9mm pistol length upper, with bcg and charging handle. The Glock lower has to have strong magazine springs or it will not lock back 100% of the time. Regular Price $926. JP enterprises, foxtrot mike also make good lowers. PSA PX-9 Forged Complete MOE+ EPT Pistol Lower w/ HBPDW Brace, Black. 13 models Ghost Firearms Elite 9x19 Para Upper Receiver (2) As Low. Serial# blocked for security reasons. Spikes Tactical 2036 Apex Ct. Spartan ar9 upper Spartan ar9 upperthis upper is build on slick side billet upper receiver, non-lrbho. Lower includes Palmetto State Armory's Last Round. AR9 Bolt Carrier Group Compatibility. AR9 Bolt Carrier Group Compatibility. This spare parts kit is specially designed for New Frontier Armory uppers with the LRBHO (Last Round Bolt Hold Open) feature for AR-9, AR-10, AR-40 and AR-15 platform firearms. Accented with Front and Rear Take Down Pins in Stainless Steel The selector markings are bullet pictograms Type III Hard Coat Anodizing The UDP-9 is a finely-tuned 9mm AR-15 carbine that's compatible with Glock and Glock aftermarket magazines Our AR-9 Glock style "Lock-Back" Stripped Lower Receiver is manufactured to Mil-Spec standards and is the. Made from 7075-T6 aircraft grade aluminum billet;. 5" MLOK Handguard / Kak Blade ALL NEW AND IMPROVED DESIGN AR9 STINGER SERIES- NEW Dedicated Lower - NEW Last Shot Hold Open - NEW Accepts Glock Magazine - NEW Short Stroke Buffer System Specifications: Caliber: 9mm (Semi-Automatic) Upper. Features a broached mag well and milspec 8625 type III, class 2 hard anodized. Quoted: The benefit is that you can use a standard AR lower. The EPC-9 upper receiver is the perfect addition to any AR9 build. Unlike some of the other posts for FULL AUTO M16 STYLE lowers, there is NO drilling or cutting requried on this lower. Accented with Front and Rear Take Down Pins in Stainless Steel. An Anderson USA made lower parts kit is used and the trigger and hammer have been deburred and polished to provide a smooth trigger pull of 5-6. This magwell design uses less material but isn't significant enough to provide any noticeable weight saving. Home / ALL PRODUCTS / Custom Packages / Custom Complete Uppers / Custom Upper AR9. Designed to match lines with New Frontier Armory C-9 and C-45 Billet Lower and most forged lowers **NOTE: Some rail systems that use anti rotation tabs may need slight modification to fit this upper. 99 80% AR9/AR40 - Glock Magazine - Standard Lower - Flat Front - 7075 Raw (No LRBHO). To complete your build, we recommend selecting an AR9 upper assembly or build kit that utilizes the PSA G-9 Hybrid Bolt Carrier Group (compatible with stripped AR-15 uppers, Glock® magazines, and the AR9 80% lower). Not the unreliable lever type. The 9mm barrel and Glock mag compatible bolt are both from Spinta Precision. For the quickest "building" experience, simply pair an AR-9 complete upper with an AR lower build to accept 9mm magazines. geometry dash world apk full version 2022, jenni rivera sex tape
How to adjust the Last Round Bolt Hold Open (LRBHO) on your AAO Glock or S&W AR9 Lower. . Ar9 complete lower with lrbho
which have a little tab that pushes up on the bolt catch just like your standard AR in 556. 40 S&W,. The KE-9 Billet lower receiver is precision machined in-house from hi-grade billet master plate to milspec standards making it compatible with most milspec 9mm uppers. 9mm Carbine Lowers Get the perfect foundation for your 9mm carbine with a complete or stripped lower right here at Palmetto State Armory. Our LRPK is the perfect way to finish off your build. The JT-9 Lower Receiver in 80% completed form. Not the unreliable lever type. 40 S&W and. GEISSELE 2 STAGE G2S $ 165. Including a last round bolt hold open mechanism and compatible with most standard AR15 barrel nut and handguard combinations this upper receiver will help take your pistol caliber build to the next level. A couple of examples of these 9mm lowers would be JP Rifles GMR 13, CMMG MK9 SMG dedicated 9mm lowers, Orion and Colt 9mm lowers if you can locate them. Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Kaw Valley Precision AR-15 8 The Foxtrot Mike Products 9mm Upper Receiver comes fully assembled and ready to drop on any pistol caliber lower receiver that uses Glock magazines Sale Price - $585 95 Quick View GIBBZ Arms G9 9mm Side Charging Upper Receiver $ 219 95 Quick View GIBBZ. 357 SIG, and other calibers. Features: Machined from billet 7075-T6 aluminum. Most builders will use a 9mm AR pistol kit to to build from scratch. Well for the 80% AR-9 lowers sold by us, here at 80 Percent Arms,. 00) (12 reviews) Write a Review. Our lower also works with +10 and +20 extensions. This Spikes Tactical ST9G 9mm pistol lower is custom built using the top of the line Spike's Tactical lower receiver assembly that uses Glock magazines and has a great last round bolt hold open (LRBHO). AR 15 Stripped Upper Receiver - Black $70. Serial# blocked for security reasons. View Details. AR-9 9MM GLOCK STYLE COMPLETE LOWER WITH ALPHA STOCK - LRBHO. LRBHO worked 100% of the time. plus i personally like the colt mags , they are easier to load. Hello: I have a Glock and a Colt QC10 lowers and they both have been 100%. 99 $ 449. Can be converted to a rifle configuration with a different buffer tube and stock. Ar9 Complete Lower. Start your AR-9 build off right with the FM Products 9mm complete lower receiver. This is the same basic process used to upgrade the. 9mm Carbine Complete Guns Palmetto State Armory has a selection of complete 9mm carbine rifles and pistols (aka AR-9) for your next training day on the range or competition. 9MM buffer is included. The selector markings are bullet pictograms 80% AR9/AR40 - Glock 9mm Mag w/LRBHO - Finger Groove Front - AR15 Based Lower Receiver - 7075 - Anodized Black $139 Magazine: Accepts all Glock pistol caliber magazines The Glock mags with extra power springs and base pads work great Ar9 Complete Lower Ar9 Complete Lower. Complete Lowers Receiver Sets Shop All Lowers Upper Receivers Stripped Uppers Assembled Uppers Complete Uppers Receiver Sets Shop All Uppers Handguards Free Float Handguards Drop-in Handguards Shop All Handguards Barrels 5. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. We have a wide selection of pistol caliber carbine lowers for your next build. Only the best parts used to complete the lower. Limited stock! 🔥 1 person is viewing this. 99 (You save $20. This Spikes Tactical ST9G 9mm pistol lower is custom built using the top of the line Spike's Tactical lower receiver assembly that uses Glock magazines and has a great last round bolt hold open (LRBHO). 99 $ 449. This D3-9SD lowers has a bulletproof "hinged" Last Round Bolt Hold Open (LRBHO) design. 99 – $ 180. 0 star rating. ar-9 9mm glock style complete pistol lower w/ sba3 adj brace - lrbho FFL Terms and Conditions- Any items placed on the same order as a controlled item will also be shipped to the FFL. What is Spikes Ar9 Lower. If I had known this, I would have likely went with fm. 99 AMERICAN RESISTANCE AR9/40CAL PDW COMPLETE LOWER (PDW). · Search: Ar9 Stripped Lower Glock Lrbho. lower parts kit, trigger group, buffer system, and law tactical already installed for you. Let me explain! An ar9 lower has to have the same dimensions as an ar15 lower so it will fit with the upper. Rated 5. Skip to the end of the images gallery. , SBUR04, Complete Upper Receiver, Fits AR15, 223 Remington/556NATO, 16" Barrel, Midlength Gas System, MLOK. · Search: Ar9 Stripped Lower Glock Lrbho. Jul 08, 2019 · Conclusion. An Anderson USA made lower parts kit is used and the trigger and hammer have been deburred and polished to provide a smooth trigger pull of 5-6. For sale is a completed Palmetto State Armory AR-9 9mm lower designed for Glock magazines. 9mm AR Bolt Carrier Group. Including a last round bolt hold open mechanism and compatible with most standard AR15 barrel nut and handguard combinations this upper receiver will help take your pistol caliber build to the next level. AM-10 Complete Lower; AM-15; AM-9 Complete Lower; STRIPPED LOWERS. The hardware kit includes a steel bolt catch, polymer bolt catch housing and three screws. Barrels; Bolt Carrier Groups; Handrails;. Out of Stock. AR9 6 Posted by 2 years ago complete upper and 80% lower w/LRBHO looking in to building an AR9 soonish (obv lol) looking for recommendations on a complete mid-range quality upper, and an 80% lower that has the last round bolt hold open feature. The lower is completely assembled with a proprietary magazine catch and ejector and all your standard AR-15 lower parts. The lowers are in AR-15, AR-9, and LR-308/AR-10 platforms. Ar9 Stripped Lower Glock Lrbho. Unlike some of the other posts for FULL AUTO M16 STYLE lowers, there is NO drilling or cutting requried on this lower. The stripped upper receiver offers a Mil-Std 1913 rail with white laser T-markings. Adjustable tension slide lock on charging handle. It is designed for flush mounting rails and standard handguards. Search: Ar9 Stripped Lower Glock Lrbho. Lower includes Palmetto State Armory's Last Round. An Anderson USA made lower parts kit is used and the trigger and hammer have been deburred and polished to provide a smooth trigger pull of 5-6. View Details. 99 – $ 2,249. Looking to build a PCC for my brother. 99 $ 449. thanks homies! 4 comments 81% Upvoted Sort by: best level 1 Comment deleted by user · 2 yr. 95 Sale. The last round bolt hold open (LRBHO) is the function that keeps the bolt carrier group locked back on an empty magazine once the last round has been fired. 40 S&W,. 99 $399. Unlike some of the other posts for FULL AUTO M16 STYLE lowers, there is NO drilling or cutting requried on this lower. 1,497 Posts. JP enterprises, foxtrot mike also make good lowers. PSA 9mm Classic Colt-Style Lower. 00 out of 5 based on 2 customer ratings ( 2 customer reviews) $ 149. I recommend the Rock River Arms magazine conversion block. All CBC AR-9 upper assemblies & upper parts offer superior quality, dependability, and performance. . worlds longest pussy hair