The Shadow Systems Match Barrel for MR920L/DR920 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. All of our barrels are 100% Made in the USA and are custom designed from U.S. sourced materials. - Barrel Details: - 416R Stainless Steel 1/10 Broach Cut Rifling Safe with lead bullets. - Black Nitride Finish - 1/2X28 Threaded - Thread Protector Included - Includes O-Ring. - Compatible Gun Models Include: Shadow Systems MR920L/DR920 Elite Shadow Systems DR920 Combat Glock 19 (Gen4 and Gen5 G19 Only) and Glock 17 (Gen5 Only).