BM59 Problem

[Larryjk]

If you have had experience with the BM59 please send me information. I got one in and owner said the shells were sticking in the chamber. I couldn't see any marks with a little mirror, but decided I needed to go further. I took the gun apaart and pulled the barrel. Still didn't see any marks in the chamber but put it in the lathe and brought the chamber to a shine. Put it together for testing.
Took it to the range and used Federal 150 grain factory loads. Yup, they do stay in the chamber and the bolt is locked up tight. Had to push the handle against the edge of the bench to open the action. Not a mark on the empty brass.
Is the locking system the problem or is the problem enough pressure in the case that the system won't let it unlock? There is only about 12 inches between the front of the case and the gas port in the barrel. Is it possible that the pressure in the case is too high to let it open? I don't think so and suspect the left side lock on the bolt may be the problem. Any players have an idea. Send to larryjk@tribcsp.com

[Adam Helmer]

larryjk,

It sounds to me that not enough gas pressure is hitting the piston to unlock the bolt, or gas is blowing by the piston and not giving thrust to the operating rod. I reckon you need more thrust on the operating rod.

Adam

[Gil Martin]

Sounds like a trip to a competent gunsmith is needed. It is hard to analyze the problem without seeing the rifle. All the best...
Gil

[Larryjk]

Gil Martin, Thanks for the suggestion. Do you have the name of a competent gunsmith in mind? Competency is related to experience. This is the first M-59 by Golden State Arms that has been in my shop in 34 years. I have not seen this type of a problem with the M1 Garand or MIA, which have very similar gas handling and locking systems. Dig accepted!

[Gil Martin]

I have a competent gunsmith, but he operates in Pennsylvania. If you want his contact information, send a PM. All the best...
Gil