The Madbull T2 Gemtech 7" RAS & Barrel Extension Kit is a complete front end conversion to a CQB ready AEG. This kit will give your gun a unique and flush look. The barrel is only 5" long, and since the rail is 7" the barrel extension actually connects to the barrel from inside the RIS. The result is a very clean and compact front end. All of these pieces are precision made form high quality metal and therefore are strong and lightweight. Light and nimble are two great qualities to have in a CQB guns, and with this kit you can have both.