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This weekend, about the last thing that I expected to find at a show was an Original HK21e 22" barrel and an HK21e complete Bolt Head with firing pin and spring. My question, without digging my MM21e out of the back of the safe, is if these will fit/work in my MM 21e? Specifically, will the barrel work with the pin on the carrying handle ring that my MM barrels do not have? Thanks.



