7.62x39 Issues

[center_x]

Hey all,

Im having issues with my ershaw 7.62x39 upper. It will not shoot the cheap berdan primed shells. It dimples the primer, but does not fire.

When I shoot regular boxer primed shells, the rounds fire exactly like they are suppose to, without any issues.

What is the issue? Can I buy an after market firing pin to solve this issue? Any ideas?

Thanks for your help.

[furyous68]

would it be a firing pin issue or a firing pin spring issue. Maybe the spring is too light?

[FeuerFrei]

Stiffer hammer spring.
Commie ammo made for Commie boom stick.
Really need to pound the crap out of the primer to reliably touch off the round.
Surplus ammo caveat.

[center_x]

I dont think it is a spring issue. The firing pin is free floating without any springs.

would it be a firing pin issue or a firing pin spring issue. Maybe the spring is too light?

[FeuerFrei]

http://www.parallaxtactical.com/store/wolff-colt-m4-m16-ar15-xp-hammer-spring-1038.html

http://www.davidtubb.com/tcom_images/ar15_images/cs_trigger.html

[13204u]

You likely need a stronger hammer spring. Those berdan primers are tough.

[JeffM]

This is a known issue. Heavier hammer springs are not the answer.

http://www.ar15performance.com/inc/sdetail/339

ETA: http://www.ar15.com/forums/topic.htm...f=121&t=516819