Posted: 12/19/2013 4:38:05 PM EDT
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I recently purchased an M&P40 Full Size and put one of my older 9mm barrels in it. When I have a round chambered, and remove the mag, cycle the slide the round falls out through the mag well. The same thing happens if I actually shoot the round with the mag released, the empty case falls through mag well. (As opposed to flying free as my other four M&P do)
This does not happen when I am shooting it 40 Caliber or racking the slide with a forty caliber round (Again when magazine is removed) In all situations if the magazine is inserted (9mm or 40cal) the round ejects properly. So, I believe the extractor is not grabbing the case of the 9mm is firm enough. Now, I can't send it back to S&W because it works as designed as a 40 Caliber; but I want this situation corrected in case I ever use the gun for competition. I'm considering an Apex Failure Resistant Extractor, any other suggestions? Thanks |
| FRE may help. However, beware of using a standard 9mm barrel in your 40 slide... I recall reading somewhere that the barrel may not lock up properly, resulting in wear to the slide. ETA: If the barrel is not locking up properly, you could have premature unlocking resulting in poor extraction. Might want to search a bit on this first. |
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Quoted:
I recently purchased an M&P40 Full Size and put one of my older 9mm barrels in it. When I have a round chambered, and remove the mag, cycle the slide the round falls out through the mag well. The same thing happens if I actually shoot the round with the mag released, the empty case falls through mag well. (As opposed to flying free as my other four M&P do) This does not happen when I am shooting it 40 Caliber or racking the slide with a forty caliber round (Again when magazine is removed) In all situations if the magazine is inserted (9mm or 40cal) the round ejects properly. So, I believe the extractor is not grabbing the case of the 9mm is firm enough. Now, I can't send it back to S&W because it works as designed as a 40 Caliber; but I want this situation corrected in case I ever use the gun for competition. I'm considering an Apex Failure Resistant Extractor, any other suggestions? Thanks The FRE has a more generous hook on it than the OEM extractor. I never had an issue out of the 40 with a 9mm barrel, although my 40 was fairly new. The Apex extractor is steel as opposed to MiM like the OEM extractor. I have been told by those that know more about the M&P platform, that a steady diet of steel case ammo, like Tula or Wolf can wear out the OEM MiM extractor. My 9mm saw a very steady diet of steel cased ammo. Thousands and thousands of rounds. When I started shooting USPSA and at the same time reloading for USPSA, I started experiencing multiple failures to extract with brass ammo. I bought a Apex FRE. When I removed the OEM extractor, the hook was worn and not as deep. Also the hook gets very dirty, lots of carbon build-up. Keep it clean. Since then, I have shot nearly 3 thousand rounds with no failures to extract. I would try it, if the pistol has several thousand or more rounds through it. It could also that the newer M&P's have different tolerances than others. How's the fit of the barrel? Loose or fairly tight? |
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Quoted:
It's a new pistol, barrel seems average. I think I'll rotate one of my other 9mm barrels in and see if that makes a difference first. Thanks. Do you have a set of dial calipers? If so, do what I did in the thread http://www.ar15.com/forums/t_5_16/104694_9mm_MandP_barrel_in_a__40_SandW_a_photo_comparison_UPDATE_IN_OP_Range_test.html and measure the slide. I would like to see if the dimensions from the earlier 40's are the same as the newer ones. |