The Shadow Systems Match Threaded Barrel for Glock has a spiral fluted pattern that reduces the weight of the barrel while adding somewhere for dirt and debris to exit when cycling. It is precision machined to drop-in more easily and fits tights in critical lock up areas. This highly improves accuracy! Threaded to allow the use of a suppressor, compensator, or other accessories. Features416R Stainless Steel, 1/10" Broach Cut Rifling - Safe with lead bullets1/2X28 ThreadedThread Protector IncludedIncludes the O-Ring DISCLAIMER:This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.