I'm having a fitment issues with a Magpul MOE stock and my Spikes buffer tube. The stock is indeed a Milspec and the Spikes buffer tube is obviously a Milspec tube. The problem is that once the stock gets to about position 4 on the tube it begins to become very snug, and by the time it gets to position 1 it may as well be the wrong size entirely. Positions 5 and 6 fit perfect and the stock glides between the two just right. But as I said, positions 4 down to 1 get progressively tighter to the point where position 1 is impossible to get to or from.

Has anyone else had similar problems with Magpul stocks on their Spikes buffer? This problem leads me to believe it's the Magpul. Thoughts? Thanks!

Update/Solution: Buy a CTR. The CTR fits the Spikes tube perfectly with zero problems. Not sure why the MOE is so different, but save yourself the hassle and just get a CTR to begin with.

Have any friends with AR's? See if you can try it on theirs. That should answer the question without a doubt. I will say this isn't a question we've received before.

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Unfortunately I don't know anyone else with an AR who lives close. Though you never having heard of such an issue before really makes me think it might be the Magpul. I'll have to give them a call and see if they can't help me out. Heck they are based out of where I live after all. Thanks for the response!

Well either the magpul is curved inside or the tube was not machined evenly all the way around. If you had a digital caliper you could measure the area where it snags. I would get some dry moly or teflon spray, spray the tube and slide the stock on without engaging the lock. Pull it off and see where the coating is worn off. Then measure. You,ll know your answer then.

I have had the same issue with my Spikes Mil Spec buffer tube and my Magpul MOE Stock. It gets really snug at about position 3 or 4 and is hard to slide at all at position 1. At first i thought i ordered or they sent me the wrong stock but i double checked and everything (stock and buffer tube) are Mil Spec.

Any ideas?

Light sanding inside the middle of the stock.

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I have checked both of my moe stocks and i don't seem to have this issue. My tubes are lmt and pof. It seems this is an issue only with spikes tubes. I would send magpul an email and see if they have this issue or try different tubes.

Who makes spike's tubes by the way?

I had the same thing happen with my spikes tube and moe stock... I didnt see it as a big deal though as i like a tight fitting stock.. No other stock did that though, just the MOE one.

Thanks for the replies. Sorry it's taken me so long to respond. I called Magpul and they of course think it's the buffer tube, but when I called back and talked with someone else they told me to send in the stock to them and they will see if it is indeed a problem with the Magpul. I live close to them so I'm going to send it in when I get some free time and then wait and see I suppose. They said if they discover that the stock isn't within tolerance they will send me out a new one. I guess only time will tell.

Curious please post what happens on this ,
I just ordered a spikes tube kit , and a new MOE stock for my next build - same issue

Very tight

All the reports also specifically mention the MOE stock. We use the Magpul CTR as our default upgrade and go through tons of them. There are also plenty of customers that use their own ACS, CTR, STR, & ACS-L stocks without reporting this problem on our tubes.

I have two rifles at home that have CTR & ACS stocks on them, and the woman has a lightweight build with a first model MOE on it. I grabbed a new MOE today and tried it on both rifles. Sure enough, it was tighter than either of the friction lock models from Magpul. Not only was it tight on the tube, it was also much harder to pull the pin down to slide it off. I'm used to pulling down the pins with two fingers and sliding them off (I'm used to doing it and apparently have built up the dexterity), but I had to use a tool to get it off both of them. I am thinking you guys have stumbled onto a slight change in the MOE's. It is still functional, but definitely tighter. Maybe this is something Magpul did intentionally to make up for a lack of a friction lock, since many people used to shy away from the MOE's when they first came out because they were much looser than the CTR & ACS.

Am I returning the MOE... nope. Just going to use it on a future build and know full well that it will be as solid as a CTR without the need to fumble with a friction lock.

I had just recently sent it in to Magpul and was planning on calling tomorrow to see if they had gotten it yet and if they had any info for me. I will be sure to post up.



This is interesting. I appreciate you doing a little testing for us. I'm still waiting to hear from Magpul, but from what you say, I may just pick up a CTR and not deal with it.

I've got the opposite issue with a Vltor Mil spec buffer tube (supposed to be a better tube as it cost 40 bucks and my Magpul MilSpec MOE is a little looser than i like.......

The tight spots in the MOE could be at a location that matches the grooves of the Vltor tube. Or you may not even have a MOE that is tight like the rest of us are seeing.

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I have a MOE milspec on my Spikes buffer tube and it fits fine, not too tight at all.