This AR57 Upper is constructed with a steel barrel, muzzle brake, bolt carrier group, buffer, and screws, all built into an alloy monobloc receiver. The 3 slot MLOK rails will allow you to add your favorite light or optic making this one tough tactical upper. he receiver and rail block measures just over 17 inches overall length; from the ...

The AR-57, also known as the AR Five Seven, is available as either an upper receiver for the AR-15 / M16 rifle or a complete rifle, firing 5.7×28mm rounds from standard FN P90 magazines. [3][4] It was designed by AR57 LLC. [5]

The AR57 (also known as the AR Five Seven) upper receiver for the AR-15 has two claims to fame: a 50-shot capacity and downward ejection for ambidextrous operation. Operating by simple blowback, this upper is available in 6-inch pistol and 16 …

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.

2024年2月28日 · Designed to transform any AR-15 lower into a 5.7×28 firearm, this upper assembly offers exceptional functionality and performance. In this review, I will discuss its features, advantages, disadvantages, and my overall experience with this product.

This AR57 Upper Receiver Assembly converts any AR-15 lower to a rifle capable of shooting 5.7×28 ammunition. The unique upper design loads from the top and ejects downward through the AR-15 mag well.

Panzer Arms AR57 Ultra Light Tactical 5.7x28mm Upper is a complete upper receiver that converts any mil-spec AR-15 lower to shoot 5.7x28mm ammunition. This alloy monobloc receiver is built with a 16-inch steel barrel, perforated muzzle brake, bolt carrier group, buffer, and screws.

The AR57 ULT Complete Upper Assembly, chambered in 5.7x28mm with a 12" lightweight barrel and M-LOK rails transforms any AR-15 lower into a 5.7x28 firearm. Featuring a unique top-loading design that ejects downward through the AR-15 mag well, this lightweight upper features a stronger, lighter rail with a melonite black coating.

Converts an AR-15 to shoot 5.7x28 FN. Unique upper design loads on top and accepts FN PS90 magazine (not included) and ejects downward through the AR-15 magwell. Upper is precision machined from a one piece aluminum forging. Integrated picatinny-style quad rail system allows attachment of various accessories.