Is this normal? M&P9 Slide?


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357mag357
December 14, 2012, 07:37 PM
I just cleaned my M&P9 for the first time and noticed the inside top of the slide has drill marks in it. Was this done to reduce weight or did the gunsmith at S&W get a little crazy?

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Hangingrock
December 14, 2012, 08:00 PM
I believe if memory serves me correctly that is a manufacturing production code.

9mmepiphany
December 14, 2012, 09:00 PM
Yup, it is normal...it's binary

The Lone Haranguer
December 14, 2012, 09:17 PM
Something new? Those weren't on my 2006 model.

rodinal220
December 14, 2012, 09:33 PM
Mayan code for the landing site for the mother ship.:D

357mag357
December 14, 2012, 09:40 PM
So what does my code mean? Month and Date it was born? Like on a Zippo Lighter?

9mmepiphany
December 14, 2012, 09:45 PM
No idea. I didn't even notice until you posted and I took mine apart to look...I would guess to separate batch runs, mine only has two dots

I've seen them before on a SIG 220 Locking Block; they use them to denote calibre and slide length for correct unlocking

357mag357
December 15, 2012, 06:51 AM
Thank you all for the information.

rsrocket1
December 15, 2012, 10:08 AM
Looking at this thread (http://www.ar15.com/archive/topic.html?b=5&f=16&t=108099) says it is the code for the milling machine it was made on. The date of manufacture can be found using the code on the original box.

khegglie
December 16, 2012, 10:47 AM
they are on the Shield too.

ApacheCoTodd
December 16, 2012, 11:10 AM
Looking at this thread (http://www.ar15.com/archive/topic.html?b=5&f=16&t=108099) says it is the code for the milling machine it was made on. The date of manufacture can be found using the code on the original box.
I agree, I think it's a machine signature and possible the operator's as well for quality control.

It happens in other manufacturing as well.

fastbolt
December 16, 2012, 12:51 PM
In the armorer class they tell students that the markings are put there so they can identify the CNC machine & operator and production run. This coded info may be useful if they ever suspect a manufacturing problem.

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