This is a Proto/Dye UL barrel back in .688 bore with Autococker threading — the engraved Proto script is clean and the aluminum body is in solid used condition with some light surface scuffing consistent with field use. The Autococker threads are intact with no cross-threading or damage, and the muzzle end mates cleanly to any standard UL front. At approximately 7 inches, this back pairs well with an 8 or 9 inch UL front for a full 14-16 inch setup. A solid functional back for any AC-threaded marker running the UL barrel system.
Fits: Proto Rail, Rize, DM8-DM15, DSR, M2, M3, Autococker-threaded mark
Silver / Raw Aluminum · Aluminum · Used
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