BE Fred Posted May 12, 2013 Share Posted May 12, 2013 Hello, I have a new M&P Core full size 9mm, gun came with two mags. Also have an "old" full size 9mm M&P which also hase two mags. The old mags work in new core but do not hold open slide on empty. Is there a way to modify? I do not see a difference but have not busted out the dial calipers...this is likely a common problem with a common fix (I hope). Thanks in advance for any thoughts and suggestions. Fred Link to comment Share on other sites More sharing options...
Bob Hostetter Posted May 12, 2013 Share Posted May 12, 2013 There are least 3 different followers used in the 9mm mags, some work better then others. Link to comment Share on other sites More sharing options...
JimM Posted May 12, 2013 Share Posted May 12, 2013 I have an older M&P9 mag with a black follower that occasionally fails to lock the slide back. I don't have that problem with my other mags that have gray followers. Could the solution be as simple as upgrading the follower...or the magazine spring? Link to comment Share on other sites More sharing options...
wgj3 Posted May 13, 2013 Share Posted May 13, 2013 Almost definitely a follower issue. Older, weaker springs could cause issues as well. Browsing the S&W/M&P forums should yield some insight as to which follower works best, exactly how to ID it, and where to find more of them. Link to comment Share on other sites More sharing options...
Klemmer Posted May 20, 2013 Share Posted May 20, 2013 Don't tease us -- what is the short answer on best follower and source(s)? Link to comment Share on other sites More sharing options...
wgj3 Posted May 21, 2013 Share Posted May 21, 2013 For my .40 Pro, I collected ab 8-10 mags over the course of a year or so 5-6 for Production (finally legal)/IDPA and 3-4 for Limited. Some polished bodies, some matte. Tube finish hasnt seemed to matter in my gun. What I did notice was that in all the mags, I had two different types of followers; one type had "40" on the top, the other is blank. I found that the ones with "40" on top seemed to work better and allow an extra round in my limited mags with TF extensions. I contacted S&W and told them that I needed 6 of the followers with caliber on them and they sent them to me. Not sure if they can still be had for free. If anyone needs the other style followers, I have a few that I could pass along. As with most things mag-related, YMMV... Link to comment Share on other sites More sharing options...
Stephen7942 Posted May 22, 2013 Share Posted May 22, 2013 The newer style grey followers work very well in my FS 9mm - They are a bit shorter than the old grey followers. I too had some older blued mags and newer matte finish mags and the newer style follower worked best. Link to comment Share on other sites More sharing options...
Mike62 Posted May 22, 2013 Share Posted May 22, 2013 I have both old a new style mags/followers, and both work great. Unless there is visable damage to the follower I would just replace the springs. Link to comment Share on other sites More sharing options...
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