I had this issue as well, I called S&W and asked if they had any of the old style slide releases** (the original did not have the bump or swell on it that is now standard on the M&P, it was slab sided). They did, but instead of them sending it to me to install like I wanted, I had to send the gun in to have this part changed. Free of charge of course, but annoying as its a 10 minute job.
I relented, sent the gun in, and now have no issues.
Hope this helps.
**Edit - Whoops! Edited to fix, thanks guys.
Bookmarks