Magazine springs...that's it...I have a spare recoil spring, firing pin & spring, and guide rod...never needed any of them--yet--in over 18months of shooting the bejeezus out of it...
That's what I figured. I have had two uspc 9's and one uspc 45 and shot anything from steel to aluminium to brass tmn-jhp. I had one fail to fire with remmington umc on the 45 second strike capability set it off. On the 9 one fte a quick rack solved it never replaced a thing but i don't think I've topped 3k in a gun I know theres people here who have ran like 15k.
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