I had to set a lighter spring in my comprehensive sized M16 A2 clone nevertheless it ran fantastic. Tried once more Using the 11.5" Comando Colt higher. No dice. Ran five hundred rounds of wolf by it nowadays. Didnt damage the spring in any way. Reference record entries with out https://keeganogxrg.sunderwiki.com/1652583/the_ultimate_guide_to_forced_reset_trigger