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AR57 Upper, 5.7X28mm, Uses FN PS90 Mags, fits Standard AR-15 Lowers

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Complete upper assembly needed to transform your standard AR into a 50 round, FNH 5.7 powerhouse! Top-mounted magazine, not included, holds 50 rounds to allow for straight-line, lower profile, and no extending magazine to interfere with prone shooting. The clever design ejects spent casings down the magazine well, eliminating flying brass and hot cases going down shirt collars. The upper receiver and rails are precisely milled from a monolithic block of 7075 T6 aircraft aluminum, and will accommodate any style of sighting system. Features an ER Shaw 16" barrel with flash hider, no gas system to get fouled which makes maintenance a snap! 
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