I just received my commercial-spec Magpul MOE stock and put it on, and it's VERY tight. I saw someone on this forum say that the buffer tube is commercial-spec, so I bought that. Now, apparently, after searching I see others saying that it is mil-spec. So...wouldn't that mean that my stock would be loose, and not the other way around? I'm pretty confused. I have it adjusted to where I want it (manhandled it), so that's fine because I don't expect to move it much at all, but what's the deal?? Yes, it is a genuine Magpul product. Came in the retail box, will everything included, even the Magpul sticker. The box has a sticker on it that says commercial-spec. Is it possible that it was mis-labeled and I actually got a mil-spec stock?

Sent from my iPhone using Tapatalk

i had the same problem. i lightly sanded the buffer tube and added a light coat of lube. works great.

Yeah, the stock came with this diagram in the box. I still don't understand how a commercial-spec stock can be tight on a mil-spec tube, though...there is no way it would ever fit on a larger commercial-spec tube then!

Well, lets break it down so we can see.

1. Measure your extension tube OD.
2. Measure the ID of the stock.
3. Answer this - Where did you order your stock from?
4. Is there a chance this is the WRONG stock, either in the wrong package (return, mispacked), or just completely sent the wrong size?
5. Is your stock authentic? Answering the above may answer this. There are ripoffs of EVERYTHING.

Lets go from there.

__________________
Disabled Army Vet - 37F/82C

Since I finally got it on and adjusted with a lot of effort, I'm in no hurry to get it off just to measure. However, I got it from ebay, and it came from US, in a magpul box, with all the instruction manuals and fit guides that it was supposed to. Even had the Magpul toolbox sticker and the fold-out poster in there. The serial number on the stock itself is 1LX50 and it has Magpul branding on it. I'm 99% sure it's authentic. Maybe it's a mislabel on the box, or the wrong spec stock was put in.

As I said, it works, and seeing as how I'm in NY, I'm pinning it tonight to make it legal because we aren't allowed to have adjustable stocks, so I wouldn't be adjusting it anyway. I was just curious.

Look at the screws on the recoil pad. Should say magpul on them. Pretty sure fire way to determine a fake or not.

Also, either way commercial or milspec, it shouldn't fit with such effort.

I would guess your buffer tube/extension is out of spec.

Yep, the hex screws say MAGPUL USA on them.

If you take the recoil pad off it should have a "c" for commercial or a "m" for milspec... got this info from Magpul a while back...

Someone may have replaced the commercial stock in the box with a mil spec then returned it, that happens, even with the seal still looking like it hasn't been tampered with. Only way to tell is to measure it. FWIT my MOE stock was tight on my MOE, especially at a certain point when moving it. Slight sand or just operating it loosened it up. I did the same with the mag well as my mags wouldn't drop out and had to be removed by hand. They drop now after a little minor work.

I just measured my buffer tube/extension tube and it is 1.14 at the end and where it is snug it measured 1.15. Mill spec buffer tube/extension tube. The commercial stock if it is, should be slightly loose or your buffer tube/extension may be out of spec's like someone else stated..

__________________
Psalm 23:4

I did the same thing shortly after I bought my first 15-22. The guy at a local gun shop told me that the commercial spec magpul stock would fit on my 15-22, when I got home and put it on it was pretty snug and a pain in the a** to adjust. Later I found out through members on here that the 15-22 has a mil-spec receiver extension, so I swapped out the comm-spec MOE stock for a mil-spec MOE stock and it fits like it belongs there now. No drag at all and its a breeze to adjust like it should be.

__________________
Sappers Lead The Way

There's a letter C. So basically my Magpul commercial-spec stock is extremely tight on a mil-spec tube. Weird.

But...the commercial-spec stock is meant to fit on a larger tube, so shouldn't it be loose on your gun? Why was it tight?

Physics tells us that matter can't occupy the same space. As a former machinist who is now a designer I can tell you that putting a .250" dowel into a .250" hole requires a hammer. The difference between the two tube specs is .024". Even if you add .005" per side of clearance on the stock you would still have to beat the heck out of it (and most likely break something) to get it on and even that seems beyond what anyone would attempt.

Excellent question that I really don't have an answer for. It was loose towards the end of the receiver extension but as I would adjust it closer to the receiver it would get tighter. All I know is it works great now that I have the correct stock on there.

It sounds like it's not really an issue anyway since you gotta have a pinned stock.

__________________
Sappers Lead The Way

Yep, it's not an issue anymore. It was just bugging me!

it's hard to tell from the attached drawing since there it's not dimensioned, but perhaps there is a dimensional difference in the bottom grooved portion of the tube (where the adjustment pin holes are) and that's where the hangup is in the commercial stock on mil-spec tube. It would almost have to be if your tube OD is in (mil)spec, and the stock ID is in (com)spec.

If somebody had both tubes , put your calipers on the tube and measure the cross-sectional height of the tube. Maybe the milspec tube will actually be taller from the top of the tube radius to the bottom of the pin block grooved area, or the width of the pin block area is different

I switch stocks between my AR "T" and my 15/22 all the time.

The "T" is Mil-spec, the stocks fit both rifles fine, so I'd say the buffer tube of the 15/22 is Mil-Spec.

__________________
AKA: "Strange Tamer"

Mine is weird, I have the mil-spec on the MOE 15-22 and it wobbles a tiny bit in every locked position. It doesn't affect my shooting, but I thought it wasn't supposed to wobble unless it was fully extended. It fits perfect on the tube, though.

On the 15-22, a *little* bit of wobble on the MOE is to be expected (more so than you would get on a standard AR-15 tube). If you want a tighter lock up, then the CTR (or other derivative, STR etc.) is a better option. Definitely mil-spec though, either way.


Sent from my iPad using Tapatalk

I put a CTR on my 15-22 and have never regretted it.

Thanks for the clarification. I didn't expect that anything was wrong and the very little movement doesn't affect my shooting at all, but good to know it's normal.

Yeah, I bought a STR for my AR, threw it on my 15-22 on a whim or a quick trip to the range - which was a mistake, since now I'm going to have to buy another one lol... It's amazing how a little extra cheek transforms the entire fit of a rifle/buttstock.