I havent tried putting a new recoil spring in, I will try it. I think I might have some tactical master parts around I could throw in there. But also with the metal slide comes increased gas consumption, the KJW 1911 has continued to impress me the more I fire it. I havent stripped it down yet, but the gun seems really solid. I wouldnt be suprised if its an exact WA design inside. The gun actually outshot the KJW Mk1 Carbine that I picked up today, which really impressed me. It even outranged my SR16 (stock internals and short barrel tho). Id put it up there with the KJW/TM berettas as the best skirmish GBBs out there.