Home / Products / Ar57 / AR57 16\" Complete ULT M-LOK Upper Receiver 5.7x28 Caliber With BCG, Muzzle Brake, M-LOK Rails and 1-50 Round Mag, Drop In Ready

$AR57 16\" Complete ULT M-LOK Upper Receiver 5.7x28 Caliber With BCG, Muzzle Brake, M-LOK Rails and 1-50 Round Mag, Drop In Ready$

AR57 16\" Complete ULT M-LOK Upper Receiver 5.7x28 Caliber With BCG, Muzzle Brake, M-LOK Rails and 1-50 Round Mag, Drop In Ready

Name: AR57 16\" Complete ULT M-LOK Upper Receiver 5.7x28 Caliber With BCG, Muzzle Brake, M-LOK Rails and 1-50 Round Mag, Drop In Ready
Brand: Ar57
SKU: upc:051497297985:qty:50

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MSRP

$599.99

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Updated

Aug 26, 2026

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Specifications

Brand

Ar57

MPN

AR57-ULT16

UPC

051497297985

Description

AR57 16\" Complete ULT M-LOK Upper, AR57 Mfg, Factory new. Comes with a 16\" lightweight barrel with M-LOK rails. This AR57 Upper Receiver Assembly converts any AR-15 lower to a rifle capable of shooting 5.7x28 ammunition. The unique upper design loads from the top and ejects downward through the AR-15 mag well. The new generation upper has a stronger, lighter, and more streamlined rail; finished with a beautiful ultra-smooth melonite black coating. Comes with one 50-round magazine.