I had to place a lighter spring in my comprehensive sized M16 A2 clone nevertheless it ran good. Attempted again Using the 11.5" Comando Colt upper. No dice. Ran 500 rounds of wolf via it currently. Didnt damage the spring in the slightest degree. Which implies the firing pin isn't https://rare-breed-frt35678.onesmablog.com/rare-breed-frt-trigger-no-further-a-mystery-77906055