Back in Stock - Cope's Distributing offers AR-57 Upper 16" (5.7x28). AR-57 upper drops on a standard AR-15 lower and converts your gun to shoot the FNH 5.7x28 cartridge using FN-P90 50 round magazines. First ever, revolutionary top load bottom eject system sends the spent brass straight down through the AR magwell. Designed with reliability as its primary feature. There is no gas system to become clogged with carbon or fouling and maintenance is a snap. The bolt and chamber stay clean through extended shooting sessions.
The rails are precisely milled from a monolithic block of aircraft grade 7075 T6 aluminum with type III Teflon infused annodization. Any sighting systems mounted on the rails will stay zeroed through the toughest of missions. Comes with a buffer!! Magazine NOT Included.

AR-57 Upper 11" Assembly "SBR"/Pistol 5.7x28
[BS1-AE14]
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.