These uppers feature the original smaller .380 sized ejection port but is left open at the bottom so that it will fit either a large or small magazine well lower receiver. This upper can be configured in with the following barrel options:
- Standard .380 barrel.
- Stubby 4-1/2″ barrel with 1/2-28 threads in .380.
- Standard M11/9 barrel in 9mm.
- Standard M11/9 barrel converted to .380.
- M11/9 4 -1/2″ stubby barrel with 1/2 x 28 threads in 9mm.
NOTE: This product is just the upper and barrel with no bolt, pictured with optional stubby barrel and 1/4″ rail. This item is a special order item, please allow 2-4 weeks before shipping. We do NOT recommend shooting barrels with 1/2-28 threads exposed due to the thinness of the barrel wall at the 1/2-28 threads. Repeated firing with exposed threads may cause the barrel wall to weaken and/or split. We recommend always using shooting this barrel with a barrel accessory, such as a thread protector, flash hider, or suppressor firmly secured to the end of the barrel .