I'm also buying a M&P15T very soon. I can't find out if that has a mil-spec or a Commercial. From someone's post on here it has a commercial. Is that true? How hard is it to replace it....
its not hard at all. just get a stock wrench and maybe a torch to heat it up.
turn the castle nut counterclockwise until it breaks loose. (heating it up a bit helps just don't over do it) carefully rotate the castle nut until you can remove lift the plate under it up so the rear take down detent spring doesn't go flying.
after you have the castle nut backed off and the plate lifted back put your thumb on the buffer spring Detent (there is s spring uder it as well and it will go flying if you don't hold it down) then twist the receiver tube off
take the plate and castle nut off the old receiver put it on the new receiver thread the new receiver tube on to the lower once it reached the point of the buffer spring detent push it down and thread it over it. until the the tube and plate are lined up then tighen everything up. and either locktight or stake the castle nut
but the M&P should have a Mil Spec tube.
