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Old 10-07-2012, 08:46 PM
xzhync xzhync is offline
Join Date: Jul 2010
Location: Michigan
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Originally Posted by Coastie762 View Post
EXERCISINGTHE2ND, None of my M&Ps have the internal lock, so at least in my case they are a non-issue. I have not heard of any firing-related problems traced to the internal locks in the M&P series (unlike the revolver system).

I think the issue is more related to the "one size fits all" system in use for various parts of the M&P platform. Except for barrels and mags, pretty much every other part will interchange between the 9mm, .40 and .357 Sig, caliber pistols. Thats great for mass production; less so for tuning a pistol to different calibers of differing power levels. For example, the same strength recoil spring assembly is used for the above three calibers. Works, yes but probably not optimal.

Midway had slide stops in stock and I needed some other stuff anyway so I've got one on order. There are a few tweaks I want to try to confirm that the problem is actually related to the slide stop. I figured that if I screw it up, I still have the original one to reinstall.
The thing I find curious is if it turns out to be the slide stop then, in my case, why does the slide dragging issue only occur with the 10 round mag and not the 15 round mag?

Do you have both mag sizes? Does it happen with both or just one mag size?

Yesterday I measured the distance between the mag feed lips and found the 15 round mag was over 1/64 wider. I opened up the the feed lips on the 10 round mag and polished the surface. That seemed to make a difference when hand cycling rounds through the gun. I haven't been to the range with this mod, but hope to this week.

I wonder if the spring on the slide lock can be adjusted (tightened)?

I would think that if it is the slide lock, by installing a new one, the problem would temporarily go away.

It is sad, but I think the folks on this thread will solve this problem far faster than Smith & Wesson. When I sent mine in for this problem they polished the feed ramp and replaced the extractor and spring. I am not a gunsmith and I can tell you that their fix is nowhere near the right solution. It really irritates me when they don't even make a reasonable attempt at fixing a problem.

Please let us know what happens with the new slide lock.
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