you have to SEND IT IN!!!!!!! now i cant say about other companys that sell single shot rifles, but NEF makes you send it in for barrels. i know TC and mossberg used to sell barrel w/o fitting them, but you have to have these fitted for it to be a safe firearm to use. i own 8 NEF/H&R guns, and a couple will swap over and fit right, the others do not fit right. i dont know who told you that you can buy them w/o having them fitted, but they are WRONG.