Our AR15 rifle set is designed to fit the AR15 rifle with a standard A2 length buttstock and with a 12 inch hand guard that mounts between a triangular cup and the delta ring. Everything will fit with no modifications.
A1 Rifle
If your firearm has a standard A1 length buttstock then you will need to purchase an A2 buttstock spacer (Brownells item #430-000-455 or #231-000-155). The pistol grip and hand guard will fit with no modifications.
Carbine
The pistol grip fits directly. Our carbine style hand guard fits this type of firearm directly and mounts between a round cup and a delta ring. For the buttstock you will need to remove the collapsible stock and the receiver extension tube and replace these with a A2 rifle stock completion kit. For example, Brownells item #080-000-554. Refer to the following youtube instructional video https://www.youtube.com/watch?v=Z7ulYJN6OCo
Mid-Length
We have a mid-length hand guard. It is triangular and similar to the A2 guard. This mounts between a triangular cup and the delta ring.