HK21 Factory Magazine Adapter RARE!
HK German made. Magazine adapter slides in where the feed mechanism would be and allows use of any HK G3 & HK 91 magazine. This is the best variation of the magazine adapter ever made and it is rare. This is a must for every HK21 owner. Adapts the 100 round beta magazines and the AA50 round HK G3 & HK 91 Drums. NOT FOR USE ON THE HK21E MODELS. ONLY THE OLDER HK21 STYLE FIREARMS.
- Brand: HKPARTS