is your rifle a kit gun as in home built with parts kit?? if it is, this is a common issue as not all non-hk parts work with hk recievers. cant really mixmaster the hk 33/g3 type rifles.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent