Tac 47 Industries http://www.tac47industries.com/content-categories/cat-327_335/uppers_and_conversions.html Tue, 22 May 2012 14:57:56 -0500 en New Aero Precision AR57 5.7x28mm complete upper half for M16/AR-15 type pistols or short barreled rifles. This revolutionary design allows the use of 5.7x28mm ammunition on the AR15/M16 Platform. Simply attaches to AR15/M16 type Rifle/Pistol lower halves like any standard upper. Ejects through magazine well. Accepts PS90 magazines (up to 50rds!). Includes buffer. Complete assembly with "SBR/Pistol" 11" Barrel, Flash Suppressor, Bolt and "Carbine" Buffer. Magazine not included. All NFA rules apply. http://www.tac47industries.com/content-product_info/product_id-2228/ar57_upper_reciever_11_assembly_sbr_pistol_5_7x28.html http://www.tac47industries.com/images/products/AR5711inch.jpg http://www.tac47industries.com/content-product_info/product_id-2228/ar57_upper_reciever_11_assembly_sbr_pistol_5_7x28.html