Home / Gun Parts / Ar Five Seven Center / AR57 Ultralight Tactical AR-15 Complete Upper Receiver 5.7x28mm 12" Barrel
▼ 13% below avg
AR57 Ultralight Tactical AR-15 Complete Upper Receiver 5.7x28mm 12" Barrel
Lowest Listed Price
$599.99
MSRP
$742.8
Savings
19% off
Retailers Reporting In Stock
7 Stores
Updated
Sep 2, 2026
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Specifications
Description
The AR57 Upper Receiver Assembly converts an AR-15 to shoot 5.7x28 FN ammunition. The unique upper design loads on top and accepts FN PS90 magazine (not included) and ejects downward through the AR-15 magwell. This upper is precision machined from a one piece aluminum forging. Forged from one 7075 T6 Mono bloc Aluminum, called a Kryptonite Mono bloc with a Black Melanite Treatment Finish.
