Machining on slide question - MP-Pistol Forum

Machining on slide question

This is a discussion on Machining on slide question within the MP Gunsmithing forums, part of the Smith & Wesson MP Forum category; I have a F/S and a C in .40, i don't know the manufacture dates but the C is newer. I was comparing them tonight ...


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Old February 16th, 2016, 05:51 PM   #1
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Machining on slide question

I have a F/S and a C in .40, i don't know the manufacture dates but the C is newer. I was comparing them tonight and noticed some machining done to the F/S The center rib is milled down .100" compared to the C. Does anybody know if this is factory, or has someone modified this, and if so why?



I removed the greatly oversized photo and reduced it to a more practical size. That photo was 5312 pixels by 2988 pixels, far too big to view and over 3 mb in file size, reduced to 800 x 507 and 46 kb in file size. G56
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Last edited by G56; February 16th, 2016 at 07:33 PM.
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Old February 16th, 2016, 07:35 PM   #2
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Both my full size M&P's are like the slide shown on the top, I don't recall seeing one like you have on the bottom, I have no idea for the milling. My original M&P was made in 2006.
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Old February 17th, 2016, 03:14 AM   #3
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I had a friend check his, top 2 are full size and lower is a compact
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Last edited by G56; February 17th, 2016 at 08:44 AM.
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Old February 17th, 2016, 03:15 AM   #4
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I removed the greatly oversized photo and reduced it to a more practical size. That photo was 5312 pixels by 2988 pixels, far too big to view and over 3 mb in file size, reduced to 800 x 507 and 46 kb in file size. G56
Sorry about the size the other one i posted is the same size
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Old February 17th, 2016, 06:52 PM   #5
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All of my five; three M&P9's, a 9c, and a Shield9, are machined level.

They were manufactured from '07 through '15.
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Old February 18th, 2016, 02:20 AM   #6
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A lower rail pawl height would allow insertion / seating of a full magazine easier when the gun is in battery.


Caution: Pseudo-science and / or amateur photos may be embedded in this post.
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Old February 18th, 2016, 02:50 PM   #7
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A lower rail pawl height would allow insertion / seating of a full magazine easier when the gun is in battery.


Caution: Pseudo-science and / or amateur photos may be embedded in this post.
That's the only advantage i have been able to come up with. I can easily insert a full mag into my full size with the machined slide, where as i have to apply some pressure to seat a full mag in my compact.
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Old February 19th, 2016, 07:21 AM   #8
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Rather than mill the rail to achieve the same goal, many experts recommend "downloading" your re-load magazine capacity x 1(e.g. load 16 rounds in that 17 round magazine) that increases the probability that a tactical reload will not be FUBAR'ed in a critical moment...16 in the gun is better than 17 on the ground !


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