I have a M&P15T. Will mil spec uppers fit?
- Thread starter Todd77
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Yes sir they will fit...I have seen alot of rifles advertised recently with mixed uppers and lowers. I think over the last year or so quite a few people bought Sports so they could put a different upper on it.
So is the M&P15T mil spec? This isnt the "sports" version.
I have read that the buffer tube or receiver extension tube are not? I dont know what parts these are. I also want to add a mil spec mag pul stock or slide fire to it and it says mil spec so do I need to buy any other mil spec parts in order to replace the stock?
I have read that the buffer tube or receiver extension tube are not? I dont know what parts these are. I also want to add a mil spec mag pul stock or slide fire to it and it says mil spec so do I need to buy any other mil spec parts in order to replace the stock?
The lowers are all made so that they will interchange on the uppers. the "T" uses the same lower as the "Sport" I am reasonably sure. The tubes you are talking about is the tube that the buttstock slides on. On my sports they are mil-spec, if you do a search in the forum the actual dimensions have been posted somewhere. I am getting ready for Dinner or I would look it up for you. To add the Stock you should be able to purchase the stock and remove yours and slide the new one on. As far as the upper, just purchase a complete 50 beowulf upper so that you have everything. I know nothing about the slidefire stocks. I have never seen one or used one but that should answer your questions.
Any mil-spec adjustable stock or upper should fit with no modification. If you want to add a fixed rifle stock then you'd have to change the buffer tube.
cyphertext
US Veteran
S&W states that they are made to mil-spec dimensions, but you should measure to make sure. Here is the link that oneyeopn was referring to.
http://smith-wessonforum.com/smith-wesson-m-p15-rifle/285367-how-do-i-know-if-my-buffer-tube-milspec-commercial.html
http://smith-wessonforum.com/smith-wesson-m-p15-rifle/285367-how-do-i-know-if-my-buffer-tube-milspec-commercial.html
HotRoderX
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I know the buffer tube on my sport was in fact a Milspec. I recently replaced my stock on my rifle. I would assume all the lowers on the Smith and Wesson are the same. I think it cost to much to produce different lowers for different rifles.
cyphertext
US Veteran
Usually, that assumption would be good HotRoder. However, with the demand that S&W faced for the Sport, and then the 15T, you can't be sure where the parts came from. I say this because the S&W marketing guy said that all uppers were forged in house, when they were doing a demo of the Sport at Gunsite. However, once they hit the market and demand started to outpace supply, we started seeing forge markings on Sports that indicated that they came from other forges than S&W. These were on brand new, out of the box rifles.
I have also seen posts on other boards where, when measured, the dimensions of the RE were in fact commercial on some S&W rifles.
Point being, they may have had to get parts from other suppliers, or subbed out part of the build, so it is best to measure. Properly calibrated calipers don't lie.
I have also seen posts on other boards where, when measured, the dimensions of the RE were in fact commercial on some S&W rifles.
Point being, they may have had to get parts from other suppliers, or subbed out part of the build, so it is best to measure. Properly calibrated calipers don't lie.
Stebo
Member
Todd,
First, an apology for deleting my response last night - I misunderstood your question and then could not get back to the thread.
I would avoid the term milspec in regards to the complete M&P15T assembly. There are milspec parts and milspec dimensions to this rifle, but there are, arguably, no true milspec complete rifles available on the civilian market.
As others have stated, any "standard", small pin AR upper should work with any M&P lower. If your question is, do you need to swap out the M&P15T buttstock to make it work with the Beuwolf upper, the answer is no. Milspec vs commercial receiver extension has to do with the exterior dimensions of the tube. The interior diameter of the tube, and overall specs of the spring and buffer are the same. Again as others have stated, if your plan is to swap out the buttstock just because you want to, you should measure the outside diameter of the tube with calipers, or borrow a milspec buttstock and see if it fits. If the buttstock is very tight or won't go on, there's your answer.
Enjoy.
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