Caliber Conversion Kits

22LR Caliber Conversion Kit Kit Includes: CMMG 22LR Bolt Carrier Group Made in the USA Machined from Stainless Steel Compatible with AR15 Mil-Spec Upper Receivers Easily Installs Does not Permanently Modify the Firearm CMMG 22LR 9"...

Always Armed 9mm Drop In Mag Block Adapter Drop in 9mm Mag Block Adapter Compatible with Colt Style Magazines Fits in any Mil Spec AR15 Lower Receiver Quick and Easy to Install/Remove  Aluminum Body

Always Armed 9MM Caliber Conversion Kit Kit Includes: 9MM Bolt Carrier Group Made in the USA Black Nitride Finish 8620 Steel Carrier 17-4 Stainless Steel Firing Pin Ramped and Compatible with Standard AR15 Hammer Works with Both Colt and Glock...

SYLVAN ARMS GLOCK CONVERSION BLOCK Easy to install and swap out Accepts popular Glock 9mm magazines Designed to work with Mil-Spec lowers Does NOT include last round bolt hold open Material: Steel and 6061-T6 Aluminum Finish: Black...

CMMG 22LR AR CONVERSION KIT All Stainless Steel Construction includes Anti-Jam Charging Handle, Cleaning Jag Guide Rod, Forward Assist Adaptor, and a 25rd Magazine. Works in most 5.56/.223 chambered rifles 3 25 Round Magazines