M&P M2.0 9mm Question on 17+1 - MP-Pistol Forum

M&P M2.0 9mm Question on 17+1

This is a discussion on M&P M2.0 9mm Question on 17+1 within the MP Full Size Pistols forums, part of the Smith & Wesson MP Forum category; Just heard something about adding the +1 when topping off your pistol, that the + 1 with a full magazine adds excessive stress to the ...


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Old April 11th, 2017, 02:29 AM   #1
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M&P M2.0 9mm Question on 17+1

Just heard something about adding the +1 when topping off your pistol, that the + 1 with a full magazine adds excessive stress to the extractor. I don't see why having a round in the chamber which is the +1 would cause stress on the extractor. Maybe I misunderstood his comment.

Last edited by usmc1963; April 11th, 2017 at 03:32 AM.
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Old April 12th, 2017, 04:54 AM   #2
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I do not see how topping off a magazine could possibly damage the extractor.
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Old April 12th, 2017, 09:08 AM   #3
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I'm not sure, but I believe this is related to a bad habit some people had with 1911's, I was guilty of it myself until I discovered it was why I kept breaking extractors on one of my 1911's.

Because of the limited magazine size on the 1911, some people would drop a cartridge into the chamber, then let the slide hit home, and then load a full magazine. The 1911 extractor was designed to feed a cartridge into the chamber, and in the normal case of feeding there is little to no stress on the extractor. When you load a cartridge into the chamber then let the slide hit home, the extractor has to go over the rim putting a lot of stress on the extractor, often causing broken extractors. A very long time ago I kept breaking extractors on a 1911, I would often load a cartridge directly into the chamber then drop the slide on it. I couldn't understand why I kept breaking extractors, finally I read something somewhere about that and realized what I was doing wrong, I changed my behavior and haven't broken an extractor since then.

Feeding a cartridge out of a mag doesn't stress the extractor on a 1911 or a M&P. Feeding a cartridge, then dropping the mag and topping it off, then loading the mag back into the pistol doesn't hurt a thing.

Now...the extractor on a M&P has a coil spring and probably wouldn't be damaged by the method described, but good practices would suggest that using the mag to charge the chamber is the better method to use.
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Old April 12th, 2017, 09:57 AM   #4
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Like others have said, I don't think it will cause any problems, and if it did, I highly doubt S&W would market their pistol ammo capacities as 17+1 and would have a warning against it in the "Safety & Instruction Manual".
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Old April 13th, 2017, 06:01 AM   #5
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Quote:
Originally Posted by G56 View Post
I'm not sure, but I believe this is related to a bad habit some people had with 1911's, I was guilty of it myself until I discovered it was why I kept breaking extractors on one of my 1911's.

Because of the limited magazine size on the 1911, some people would drop a cartridge into the chamber, then let the slide hit home, and then load a full magazine. The 1911 extractor was designed to feed a cartridge into the chamber, and in the normal case of feeding there is little to no stress on the extractor. When you load a cartridge into the chamber then let the slide hit home, the extractor has to go over the rim putting a lot of stress on the extractor, often causing broken extractors. A very long time ago I kept breaking extractors on a 1911, I would often load a cartridge directly into the chamber then drop the slide on it. I couldn't understand why I kept breaking extractors, finally I read something somewhere about that and realized what I was doing wrong, I changed my behavior and haven't broken an extractor since then.

Feeding a cartridge out of a mag doesn't stress the extractor on a 1911 or a M&P. Feeding a cartridge, then dropping the mag and topping it off, then loading the mag back into the pistol doesn't hurt a thing.

Now...the extractor on a M&P has a coil spring and probably wouldn't be damaged by the method described, but good practices would suggest that using the mag to charge the chamber is the better method to use.
EXACTLY THAT...!!!!! ^^^^^^^^
You hit the nail right on the head Gman...! Like you, i went thru this very situation with my first ownership of colt 1911`s.
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Old April 13th, 2017, 06:09 AM   #6
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Slamming the slide home on a round sitting in the chamber, not a good practice, though we`ve ALL done it. When the round is loaded from the mag, its allowed to come up underneath the extractor, behind the claw, instead of it being slammed into the head of the round sitting inside the barrel/chamber. Over time, the front face of the extractor can take a hell of a beating. Especially if your using steel cased ammo. Slamming the extractor into a loaded chamber will also weaken the coil spring over time... a weak extractor spring can cause failure to eject issues.
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Old April 13th, 2017, 10:50 AM   #7
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Topping off is trained as a standard practice at the Law Enforcement Academy I attended and is required in my Dept. My M&P .40 is always carried 15+1, going over 3 years without any ill effects. I should add my duty weapon is rarely unloaded, unless training or cleaning is required.
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Old April 13th, 2017, 02:09 PM   #8
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Sounds like something one might hear at a gun store.
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