I just bought 2 WASR-10's(did not think one would be enough) I want to ad a slant break to both, since it has to be threaded on, you only get one chance, if it gets messed up is there any way to correct it? 2nd. since all of these are imported and made to be compliant, why is it necessary to add US parts if it is compliant already,mostly any part that is added is a US part correct? I got my two from CenterFaire Systems, i think that add parts there should not be a big deal, please correct me if i am wrong.  Thanks in advance.