The base weapon is an Olympic Arms K23B "Stubby" carbine with a 7.25" barrel, much shorter than that of a Colt CAR-15 or Colt M-4 Carbine. The stock is an aftermarket Bell & Carlson Model #6906-02 Black Textured Synthetic Thumbhole Buttstock. The weapon's fore-end uses Bushmaster's proprietary four-direction Picatinny rail interface and usually mounts a tactical vertical grip. An ELCAN OS3 4x28 after-market reflex optical sight is shown mounted on the Picatinny rail atop the receiver. Carter almost exclusively uses a 100-round Beta C-Mag with this weapon, but it will accept any M16/ M4 magazines.