ported barrel attachment (for monkeemods, jet alpha, and spectre barrels)
Description
Screws on to 5/8 - 18 UNF barrels. Porting and rifling should help accuracy. I've also provided just the step for the threaded portion if you want to make your own muzzle break / rifling attachment. print at 0.12 - 0.15 mm layer heights causes a minimal drop in fps
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