This rifle is the home shop creation of one Wilfred Ellis, a talented gunsmith form Pennsylvania. It is basically a combination of an M14 gas system with an AR15 bolt and locking system, plus an in-line tubular receiver, M60 flash hider, and side-mounted magazine. Not exactly the sort of thing that will replace the M4 in military service, but an example of the sort of fun gunsmithing projects that you can put together just because it seems interesting to try. Neat!