If I load a round in the chamber and close the bolt the weapon will slam fire when on safe. It will not do this if it strips one off the mag and chambers it. Where should I start looking to cure this?
👍👍but still treat every chambering as if it will UD and keep the muzzle pointed in a safe direction.
There is nothing wrong with the rifle.Maybe I'm ignorant because I don't have any of the big bore ARs, but I don't think brushing slam fires aside like any other malfunction is a good idea.
The rifle isn't supposed to fire when you drop the bolt. Ever. There is clearly something going wrong here.
If the firing pin were sticking out it would slam fire when it strips from the mag, too. Same with a headspace issue I think. Pin inertia sounds feasible, you would have to fix that with a lighter pin or lighter buffer spring. I would probably replace both just to be safe.
I went to the 458 forum and new registrations are disabled.There are several threads on the .458Socom board regarding this problem.
Big Bore has written several good posts on the subject.
He mentions Never dropping the bolt on a loaded chamber and discusses the soft primers.
He also notes the possibility of a "dropped" hammer and suggests dropping the bolt Carrier several times on an EMPTY chamber and then pulling the trigger to make sure the hammer remained cocked and did not drop until the trigger was pulled.
Further, he suggests measuring to be sure the firing pin does not protrude more than 0.032" and buffing it down it is longer than that.
If the OP is not a member of the .458 board, it would be worth joining.
Glad to hear the Ti firing pin helped you, I figured it helped on the 375 socom so why wouldn't it on the 458 socom, after all they use the same basic brass and the same primers.Update. A TI firing pin did the trick. I tested it with two different kinds of ammo.
I won't be single loading and hitting the bolt release anymore either.