So, I am working on a longshot that shoots different types of ammo, including a 3 dart shotgun, megas, single elite, rival 1-3 etc. It will be running on 26 kg. I'm having a custom made metal plunger rod that functions as a pull back, akin nightfinder. The backplate is metal, the catch is metal, pretty much everything is metal except a stock plunger rod and a stock shell. I have heard at that high of a spring load it can warp or break the plastic. Is there any way to prevent this?
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