![]() Once the new striker spring was in, it became 100% reliable. Before I put a new striker spring into it, it had intermittent misfire light-strikes, on a certain brand of ammo. I don't automatically buy new springs for used mags. ![]() The mag feeds and locks slide back when it should, or it doesn't. Mag springs, IMO, are pretty easy to diagnose. On a used pistol, I don't know the round count, or even if the spring is the right one-I got a 4013TSW from major online vendor, and it only had one of the requisite nested pair of recoil springs-so I just go ahead and order a set, from S&W, Wolff, Brownells, Midway, or off GB. Recoil springs are relatively cheap, so I replace em by default, on any used pistol I acquire. There used to be some rules of thumb on popular pistols, like the 1911 ("if recoil spring is less than x inches, replace it"), but I haven't seen any specifics lengths, for S&W autos-which doesn't mean there aren't any, just that this guy don't know em.
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