Glock 21 Gen4 Threaded Barrel .578x28

Glock 21 Gen4 Replacement Barrel Features Machined from high-quality steel the barrel delivers consistent accuracy and long-term durability under regular use and cleaning cycles. The black finish improves corrosion resistance and helps retain a factory appearance even after extended service. The threaded muzzle (.578x28) accepts compensators brakes or suppressors to allow recoil management and customization for improved follow-up shots. Designed for straightforward installation this barrel