The core m cp has a built-in concealed ar15/m16/m4 magazine carrier that will accommodate all standard 5.56x45 (.223 rem) ar15/m16/m4 and fab defense ultimag magazines.Whether its your accuracy or numerous target engagements, you can depend on your last ten chances with the fab defense "survival" ar15 butt-stock w/built-in 10r magazine carrier and an adjustable cheek piece.The core m ar15 stock has a unique anti-rattle mechanism that holds the stock firmly in place on your ar15 tube eliminating any unnecessary rattle, furthermore the butt-stocks butt-pad in made out of a high-quality rubber to prevent it from slipping while shooting and enhancing the grip on the shooter's shoulder.The stock will fit both mil-spec and commercial tubes.

Tube Included: No