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Smith & Wesson M&P Pistols All Variants of the Smith & Wesson M&P Auto Pistols


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Old 01-09-2017, 09:44 PM
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mikesal34744 mikesal34744 is offline
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Default M&P barrel vs Sig

I love my Sigs and Smiths and know they're durable and made to last. I happen to be cleaning both my P229 Sig 9mm and my M&P M2.0 FDE 9mm at the same time and realized the M&P barrel was so much thicker next to the Sig barrel. It looks like S&W makes some them extra heavy duty.

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Old 01-11-2017, 08:30 AM
gqllc007 gqllc007 is offline
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Thats so they can use the same slide for the other calibers. The barrel of the 9mm is thicker to accommodate the larger slide opening for .40
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Old 01-11-2017, 09:42 AM
Arik Arik is offline
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Thats so they can use the same slide for the other calibers. The barrel of the 9mm is thicker to accommodate the larger slide opening for .40
This ^^^

It's basically a filler. If you were trying to put a 9mm barrel into a 45acp slide the barrel would be even thicker. In the end only the lands and groves really matter

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Old 01-11-2017, 03:28 PM
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In the end only the lands and groves really matter
This is not true. While the Sig barrel pictured is safe and serviceable, a thicker barrel is stiffer, has less whip, is safer in any kind of over-pressure event, and while heavier, may contribute to improved handling characteristics.

There is a point of diminishing returns on making a barrel thinner.
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Old 01-11-2017, 03:40 PM
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This is not true. While the Sig barrel pictured is safe and serviceable, a thicker barrel is stiffer, has less whip, is safer in any kind of over-pressure event, and while heavier, may contribute to improved handling characteristics.
I doubt that barrel whip is much of a factor when you are talking about 4-5". Rifles are a different deal. Beyond that, I've never heard of a Sig barrel developing muzzle splits the way the M&P 1.0 did in some calibers.
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Old 01-18-2017, 11:02 PM
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It might be to mitigate recoil and have a certain balance in the gun. Who knows, but I love them both.

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