Which model MP 15 is it? Ive got the MP 15a with troy rear flip up sight and ive put a magpul moe handguard with the rvg forward grip made for the moe handguards (very sturdy and price effective feels great) and have a magpul ctr stock on it with a eotech mounted on the flat rail on top. Ive got one that was entirely made by smith and wesson a couple of years back and i love the hell out of it. Much higher quality than the Shrubmaster i own and is neck and shoulders above stag arms, dpms, shrubmaster, and def olympic. If you want a great ar-15 without going the LMT, Noveske, Sabre, etc price range then you should get the smith. I cant stress enough how much i love the smith and im not a huge smith and wesson fan unless its their wheel guns.