S&W M&P 4.6" 10MM: Failure to Feed Issues

Burke888 · Sep 3, 2022

Hello,

I purchased one of the new 4.6" 10MM M&P pistols early this year. I decided to take it to the range before picking up an Aimpoint Acro P2 just to get a feel for the recoil as this is my first 10MM. I was saddened to see that the pistol had multiple failure to feed issues. After reading online I purchased a Wolff guide rod made for the S&W M&P .45ACP, along with a 24lbs. recoil spring hoping that it might solve the issue. This did not. The failures continued. I was firing SIG FMJ 180 grain 1250fps ammunition. I also tried buying a new magazine, no luck there either.

I contacted S&W and they provided a shipping label. Upon return the included note read:

Elvaluate / Repair
Polish Barrel/Chamber
Passed Range Testing

I was really excited to see that they performed work on the pistol, although I was a little skeptical that this would actually fix the issues I was having. I took the pistol back out to the range and sadly the sames issues persisted.

I think the failures have to do with how the cartridges feed from the magazine. To my eye they appear to be too vertical, which is causing them to get hung up on the chamber area. Does anyone have any ideas how I could fix this? I am really disappointed to say the least

.

stansdds · Sep 3, 2022

Looks to me like the magazine is not releasing the cartridge correctly so that the rim can ride up the breech face, the result is the bullet hits the feed ramp and rotates the round up, then you get the round stuck, the bullet against the top of the chamber, the cartridge rim stuck between the breech face and magazine follower/next round in the magazine.

In the world of the 1911 this is called "stem bind". It is the fault of magazine lips not releasing the cartridge soon enough and/or too much extractor tension or an edge on the bottom of the extractor snagging the case rim.

Burke888 · Sep 3, 2022

stansdds said:
Looks to me like the magazine is not releasing the cartridge correctly so that the rim can ride up the breech face, the result is the bullet hits the feed ramp and rotates the round up, then you get the round stuck, the bullet against the top of the chamber, the cartridge rim stuck between the breech face and magazine follower/next round in the magazine.

In the world of the 1911 this is called "stem bind". It is the fault of magazine lips not releasing the cartridge soon enough and/or too much extractor tension or an edge on the bottom of the extractor snagging the case rim.

Thank you stansdds. Any idea how I can address some of these extractor issues? I looked closely at the bottom of the extractor and I didn't notice any obvious burrs. I compared the tension by inserting a loaded cartridge and it felt about the same as an HK USP .40 S&W, but I don't have a way to actually test tension.

stansdds · Sep 3, 2022

Can't give specific advice as extractors on 1911's are pretty easy to adjust and I do not know the specifications for the S&W pistols' extractor tension. It can also be the magazine and magazine feed lips are really difficult to adjust and not completely wreck them.

cigarman454 · Sep 6, 2022

stansdds said:
Looks to me like the magazine is not releasing the cartridge correctly so that the rim can ride up the breech face, the result is the bullet hits the feed ramp and rotates the round up, then you get the round stuck, the bullet against the top of the chamber, the cartridge rim stuck between the breech face and magazine follower/next round in the magazine.

In the world of the 1911 this is called "stem bind". It is the fault of magazine lips not releasing the cartridge soon enough and/or too much extractor tension or an edge on the bottom of the extractor snagging the case rim.

Good to know
thanks

S&W M&P 4.6" 10MM: Failure to Feed Issues

Burke888

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stansdds

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Burke888

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stansdds

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cigarman454

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