Many of us bought a stock AR from a big manufacturer that came with the mil-spec plastic hand guards and would like to upgrade to a quad rail easily. We have the correct product for you and for only $24.99 you can have a very nice 2 piece tactical quadrail that will work with your existing system. no tools needed! SEE IT HERE IN OUR STORE RIGHT NOW! This 2 piece drop in quad rail will fit the following: carbon 15, MnP 15, and many other stock setups with built in sight posts and mil spec barrel nuts with delta rings