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Magazine not dropping free


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Hi everyone,

I've been having a recurring issue with two of my magazines not dropping free at the local matches. Looks like rounds are walking forward. I'm running 40S&W so OAL is a little different.
So far I've checked the following:

  • Feed lip dimensions are well within spec for all the mags
  • Rounds are loaded to factory OAL. RNFP 40S&W SNS coated bullet.
  • Center rib is polished and a nice bevel has been made.

 

What should I be checking next? Magazine spring? Any magazine catch things I should look for?

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Have you swapped the mag springs with mags that you know work well?  I'd do that, and do the same with a known working follower.  That will narrow it down if it's the mag tube, or a spring / follower issue.  

 

By chance, is the mag catch reversed for a lefty? 

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3 hours ago, B21 said:

Have you swapped the mag springs with mags that you know work well?  I'd do that, and do the same with a known working follower.  That will narrow it down if it's the mag tube, or a spring / follower issue.  

 

By chance, is the mag catch reversed for a lefty? 

 

I have not. I will do that now. 

 

The magazine catch is for right hand.

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I find that RNFP bullets need to be seated a bit deeper than RN - rounds can tip as they feed and the FP can wedge or stick.  Seating the RNFP 0.020" deeper cured my problems.

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