I needed to place a lighter spring in my whole sized M16 A2 clone but it ran wonderful. Tried out all over again with the 11.five" Comando Colt upper. No dice. Ran 500 rounds of wolf by way of it now. Didnt damage the spring in the slightest degree. But https://emiliowbtkb.blogsmine.com/37130742/5-essential-elements-for-forced-reset-trigger