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.
HK21E & MM21E Belt Box
Brand new HK21E, MM21E US made feed box. The German units have long since been out of production. These are exact replicas of the German units. Made in the USA.
Compatible...