Changing pinned stock on M&P Sport 15

[Beetle218]

rojasj,
I have an M&P15-FT (Fixed stock T model). The buffer tube/receiver extension that comes with the FT (I'll assume all the other M&P fixed stock models are the same here) has a mil-spec diameter but is longer than the commercial and mil-spec tubes. They are bored out to the same depth of a commercial / mil-spec tube so no need for a new buffer or buffer spring. I would purchase a new milspec carbine buffer tube; forged 7075 preferably. Then purchase a new mil-spec fixed stock like the Magpul MOE Fixed Carbine Stock MAG480 or pin an adjustable stock to the new carbine buffer tube.
I "pinned" a MOE stock by removing the adjustment mechanism and inserting a Magpul dummy round. The .223 round "coincidentally (?)" fits within the MOE stock and with a slight taper will fit in the adjustment holes of the carbine buffer tube. This also stops the rattle that occurs with adjustable stocks. Makes for a strong installation too over a small pin.

I'm gonna try Engine Earl's method. Is there a particular brand buffer tube that is better than another?

 

[Racer X]

In Ct, They do the same thing PLUS you can NOT have a Bayonet mount on your AR either :O

Yes, because so many gang bangers and bank robbers use fixed bayonets in their crimes.

 

[Engine Earl]

I'm gonna try Engine Earl's method. Is there a particular brand buffer tube that is better than another?

No, not really. I prefer that the retailer explicitly/specifically mentions that the receiver extension/buffer tube is made of 7075 aluminum, not 6061 aluminum. The one in the pic mil-spec, 7075 from ALG Defense.