HK G3/PTR-91 Magazine Block 10/20 7.62x51mm

G3 and HK91 10/20 Block for 7.62x51mm or .308 magazines. This new design is held to the spring by removing the locking plate and installing the spring into the hole in the block. Features: WORKS ON G3 AND HK91 TWENTY ROUND MAGAZINES. G3 and HK91 10/20 Block for 7.62x51mm or .308 magazines.