Quote Originally Posted by steve61 View Post
I have a No.1Mk4 sporterized rifle that, every time the bolt goes foreward it dents the cartridge case(won't chamber after this). Wrong magazine? How do I tell if it's got a bad or wrong mag.?
TIA, Steve
Assuming you mean that you have a Rifle No4 Mk1 (there is no such animal as a No1 Mk4), find a mate with another #4 that is working correctly and borrow his mag to try in your rifle. If it works well with the borrowed mag, compare the two paying particular attention to the feed lips. Adjustment may be needed.