H&K's Light Machine Guns: Rare but Effective (HK21/23 & HK11)
This guide details the modularity and caliber conversion process for H&K machine guns like the HK21E, as demonstrated by TFB TV. It covers swapping feed units and changing calibers by replacing the bolt group, barrel, and feed mechanism. The video highlights the effectiveness of H&K's roller-delayed blowback system and their naming conventions. Instruction is provided by subject matter experts with hands-on proficiency.







