After the first magazine full which I had a FTF, I've put probably 2K through my one magazine with the Mag Guts spring (+1) without an issue. They ain't cheap but they do not effect performance.
High round count shield
- Thread starter wendal
- Start date
The flat -wound recoil springs are vastly different from the round piano-wire recoil springs, and frankly I have seen broken assemblies but never an actually worn-out flat wound recoil spring. A competitor friend ran one of the flat-wound recoil springs 63,000+ rounds in one season, and it was the trigger spring that failed, not the recoil spring. He replaced all the springs at the end of the year just because the wanted all the small parts new for the next year. My 2006 M&P Pro 9mm has the original ISMI RSA with 40K+ through it. I had the striker chip off the end as the only failure. I replaced the trigger spring due to the insert looking ratty.
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