Which is what I'm using now and I like it very much.
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Thats interesting because my Range Officer doesn't lock back with the stock mags, but does with the Wilson's!
I don't know what the stock SA spring is but I tried the flat wire ones from Wilson's and can't say it really did anything. Your mileage my vary of course just saying my experience. Have not really experimented with the recoil spring in the 9mm yet. So this topic is interesting.
Ed
Following.
OP post pics just because. A 9mm PRO has been on my radar for a minute.
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