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  #1  
Old 07-01-2022, 04:06 PM
New2thepewpew New2thepewpew is offline
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Hey everyone, happy Independence Day weekend! I have what might be a stupid question. Recently purchased a M&P 15 sport 2 (NJ) compliant. I ordered 2 different stocks to replace the factory one. A Magpul and a strike industries. I was under the impression that the sport 2 was Mill spec. But either one of the stocks fit. Way to tight. They wonít even go on. I am new to all this, but am I missing something? Thanks for any help.
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Old 07-01-2022, 04:21 PM
RCL-09 RCL-09 is offline
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Generally speaking the commercial buffer tube has a slanted back. But I was under the impression that all M&Ps had/have milspec tubes. Can you measure the outside diameter?
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Old 07-01-2022, 07:23 PM
New2thepewpew New2thepewpew is offline
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So Iíve been back and forth with strike industries about this. I ordered the mil-spec stock and it does not go on. At all. The buffer tube is cut straight so to my knowledge itís mil-spec. The bottom of the buffer tube (where the adjustments are) is square. As to the strike industries and well as the Magpul stock are rounded. So is it the buffer tube or the chance that 2 stocks are either made wrong or what. Iím confused. Thanks for the help. Iím at work so canít measure it right now.
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Old 07-01-2022, 07:48 PM
kwb377 kwb377 is offline
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I have three M&P Sport II's, and all three have milspec Magpul stocks installed.

Doesn't NJ require the stocks to be pinned and non-adjustable? Not sure if that requires a different stock than a normal milspec or not...

Last edited by kwb377; 07-01-2022 at 07:49 PM.
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Old 07-01-2022, 08:13 PM
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Eric300 Eric300 is offline
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If you have a milspec stock and try to put it on a commercial receiver extension (aka: 'buffer tube'), it won't fit. Conversely, if you try and put a commercial stock on a milspec receiver extension it will be a sloppy fit. Most, (but not all) commercial receiver extensions have a slant back to readily identify them as such. Since you tried 2 different stocks that you believe to be of the milspec configuration(s), my guess is that you have a commercial receiver extension on your AR.

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Last edited by Eric300; 07-02-2022 at 12:48 PM.
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Old 07-01-2022, 10:45 PM
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Hoping this might be easier to read.


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Last edited by D Brown; 07-05-2022 at 06:05 AM.
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Old 07-02-2022, 01:43 PM
M5GUY M5GUY is offline
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I would take it in to a LGS, they will be able to help you out easily...
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Old 07-02-2022, 03:40 PM
WR Moore WR Moore is online now
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Quote:
Originally Posted by New2thepewpew View Post
The buffer tube is cut straight so to my knowledge itís mil-spec. The bottom of the buffer tube (where the adjustments are) is square.
There's a very easy, non-technical way to identify a mil-spec receiver extension for the carbine. Just aft of the threads that screw into the lower receiver, the outside diameter will neck down for the length of the extension to save a few grams of weight to help meet weight spec for the complete firearm. You'll be able to see this change in tube diameter with your eyes. If there is no change in tube OD, you have a commercial extension.

When they were first introduced my former employer bought a slew of M&P 15's . They all came with commercial receiver extensions. But, that was some time back. Unless you're swapping stocks, which extension you have won't matter.

Last edited by WR Moore; 07-02-2022 at 03:49 PM.
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Old 07-02-2022, 08:53 PM
New2thepewpew New2thepewpew is offline
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@WR Moore I see what you are saying. Looks like the buffer tube stays the same the whole way through. So that would make it a commercial spec correct? Being its NJ compliant, are there any stocks that I can use other than what it came with, or do I have to replace the buffer tube and spring as well. Thanks for the advice.
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Old 07-03-2022, 10:03 AM
WR Moore WR Moore is online now
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I have no clue about what the Peoples Republic of New Jersey will allow you do do with the stock. Logically, if you're replacing a pinned cheek piece/stock with another design and it's also non-adjustable, I'd think that would be legal. But you need to check with the NJ State Police as logic and statute law aren't necessarily the same. If legal, you should be able to fix the stock length where you want it.

As to sources of stocks that will fit commercial tubes, check out Brownells. Midway might also have some. Mag-Pul makes a bewildering array of AR accessories. If none of those float your boat, then changing the receiver extension to a mil-spec one is possible. But, the extension has to be installed correctly. Look at how the current tube lines up with the spring loaded recoil spring retention pin before you remove the current item. A replacement extension has to go in the same. You'll need a spanner wrench to remove the castle nut.

Last edited by WR Moore; 07-03-2022 at 10:09 AM.
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Old 07-06-2022, 04:07 PM
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OP, how much did you pay for it? I'm probably going to post that question, because in my area the price went up from $659 to $820. I don't know when the price increased, but I wonder if the Highland Park, IL shooting on July 4 increased its demand in particular.
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