Brownells/Uct Arms,Llc. Exo-Coated .22lr Cal Conversion Kit

.22 LR Caliber Dedicated Kit W/ 16" M4 Barrel - allows for creation of dedicated .22 LR AR15 upper .22 LR Caliber Drop-In Kit w/ .223 Chamber Adapter - allows for use in .223/5.56 uppers 16" M4 .22 LR Barrel - 1:16 twist, 1/2-28" threaded muzzle....