Belt Box Adapter
A new custom-made adapter - allows you to use HK German factory HK21E belt boxes on the HK21 older style or original style belt feds. It is a drop-in design that will...
Michael's Machines HK 21 (7.62x51/.308) Factory Style T-Rail Set
HK21 US-made rails for all HK21 builds. This is similar to the rails above, only prepped/cut for the HK21 feed mechanism.
HK21 Bolt Head Complete
New HK contract FMP HK21 production bolt head complete. HK21 parts are no longer in production making these new parts exceptionally rare. All are date coded 1985 last year...