Kel-Tec SU22E 22 Long Rifle 16in OD Green Semi Automatic Modern Sporting Rifle - 26+1 Rounds - Differing slightly in appearance and adjustability, the SU22E model comes with an AR buffer tube adapter, castle nut, buffer tube and 4 position stock, making it ideal for people that need an adjustable length of pull. If you already have a favorite AR platform stock, the adapter kit is also sold separately. Features an OD Green stock finish.