Prometheus EG Stainless Steel 6.03mm Inner Barrel (141mm - 550mm) pd-precision-dynamic Includes 1x 550 rd hicap

Includes 1x 550 rd hicap magazine

Functions: Momentary-On & Contstant-On Powered by 2*CR123A(3

Nylon-Reinforced Polymer Handguard and Pistol Grip

Patent Pending auto puncturing mechanism provides consistent reliable puncture and eliminates seal damage

or if just one is being upgraded

Prometheus EG Stainless Steel 6.03mm Inner Barrel (141mm - 550mm) pd-precision-dynamic Includes 1x 550 rd hicapPrometheus is a high end brand manufacturer of aftermarket parts with a special focus on enhanced performance. Their inner barrels are well established as being a top tier choice for tight bore inner barrels. With an inner diameter of 6. 03mm, it is a tighter fit on ammo then most stock varieties (which are in the 6. 05+ range mostly) but still not as tight as 02 or 01 barrels making them easier to work with. 6. 03mm is generally considered the sweet