INSTOCK

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.

$574.99