{"product_id":"matador-arms-montgo-9-complete-ar9-billet-upper-assembly-black-9mm-5-5-barrel-3-5-bottom-picatinny-rail","title":"Matador Arms Montgo-9 Complete AR9 Billet Upper Assembly - Black | 9mm | 5.5\" Barrel | 3.5” Bottom Picatinny Rail","description":"Description The MONTGO-9 blowback 9mm AR upper receiver, with NO BUFFER! Compatible with any AR-15* and\/or AR-9 lower (magazines for Glock® 17 \u0026amp; 19 OR Sig Sauer® P320™), the Montgo-9 gives shooters endless build possibilities while being compact and versatile.  Solid end receiver…does not require a buffer Hard anodized billet aluminum 5.5” barrel, 4140 Nitrided ½x28″ threaded barrel Full length integral picatinny rail for installing optics or sights 3.5” bottom picatinny accessory rail Non-reciprocating charging handle…can be used on right or left side 4140 steel nitrided bolt \u0026amp; trunnion for durability No tools required for field stripping OAL: 12.125”, Width: 1.47”, Weight: 3.5lbs  *AR-15 lowers will require the MagX adapter (or similar) to accept 9mm pistol magazines.  We recommend using a standard AR-15\/AR-9 trigger system, and not binary or FRT triggers.  We do not recommend running the Montgo-9 in full auto.","brand":"Matador Arms","offers":[{"title":"Default Title","offer_id":44685986398427,"sku":"MA-M9-00-G1","price":572.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/1072\/7131\/files\/179900604.webp?v=1738352597","url":"https:\/\/www.atcostammo.com\/products\/matador-arms-montgo-9-complete-ar9-billet-upper-assembly-black-9mm-5-5-barrel-3-5-bottom-picatinny-rail","provider":"AtCostAmmo.com","version":"1.0","type":"link"}