CMMG 5" Barrel and BCG Kit 4140CM SBN 9mm Luger

The CMMG 5" Barrel and BCG Kit 4140CM SBN 9mm Luger is a complete upper receiver conversion assembly designed for shooters building or upgrading 9mm pistol-caliber ARs and PCCs (pistol-caliber carbines). This kit is ideal for law enforcement and civilian operators who require a compact platform for vehicle carry, CQB training, or home defense without sacrificing the proven ergonomics and modularity of the AR platform.

Built around a 4140 chromoly steel barrel with CMMG's proven SBN (Suppressed Bolt Nose) bolt carrier group, this kit delivers superior reliability with 9mm ammunition. The 5-inch barrel length provides optimal velocity and ballistic performance for standard and +P rated 9mm rounds while keeping muzzle blast and report manageable, especially when used with modern suppressors. The durable 4140 steel construction ensures longevity through thousands of rounds.

This kit integrates seamlessly into most AR-15 platforms that accept 9mm magazine-fed systems, making it a versatile choice for various shooting applications. The total weight of 5 pounds contributes to a balanced setup, crucial for operators who spend extended periods in shooting positions. With its compact design and reliable performance, this kit is an excellent addition for any tactical shooter.