2 more question, and first one may be dumb considering your reply, so i cant couldn't put mil spec stocks the r15 right i would need to go commercial, and could i use any float tubes ?
Iffin you change the buffer tube with your stock then you can put any stock you want on it. Also just about any free float tube should work just fine for you. Keep in mind your "Remington R-15" is actually a Bushmaster in disguise. I am not saying this is good or bad. I am just informing you in case you were unaware.
That is incorrect. The R-25 is basically a DPMS with a "Remington R-25" name. The R-15 rifles are Bushmasters with the "Remington R-15" name. They are all owned by the same Corp.. Enjoy. -Goodspeed