Description
Heckler and Koch Castle Nut for Buffer Tube for HK416 and HK MR556
New HK German manufacture. This buffer tube castle nut will fit both mil-spec and commercial buffer tubes. All steel manufacture. With HK round tool attachment points as well as traditional wrench attachment points.
Compatible With:
- HK416, MR556
- M27
- Other AR, M4 and M16 projects
