7075 aluminum mil-spec receiver extension tubes accept M4-style adjustable carbine buttstock. Six position. Machined from lightweight aluminum extrusion then NiB-X® nickel boron coated.
18 in stock
Style: Carbine, Mil-Spec
(verified owner) – October 30, 2018
Exterior is completely coated, but the bottom 10% on the inside of the tube is either uncoated or appears partially coated/treated with something.
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