M14 Cycling issue

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I apologize in advance but I did search for this prior to making this thread.


Okay so I have a Polytech M14 in a Sage EBR Chassis.

Problem: It will fire but not cycle or eject so it's essentially a straight pull bolt action now :/

Prior to this I had fired about 400 rounds over a couple years and even got sub-moa groups. I replaced the following parts: Gas piston to a Ti-N one, Sadlak spring guide and shimmed the gas system - it is tight! (maybe too tight? idk) I haven't fired it since I changed the parts out.

So I was going to trade this gun to my uncle who is a smith and apparently now it will not fire semi auto. We smoothed the bolt carrier, the trigger, op-rod and a few other things. The rifle is well cleaned and lubed and we even put the factory parts back with the exception of the gas system shims we left those on.

We then tried 2 different mags, one used and one practically brand new. We could chamber a round, fire and manually eject it time after time with the used mag. We put the new mag in and went to eject a round and it wouldn't eject. Seems like the ejector isn't picking it up so we took the bolt apart and the ejector looks worn. I'm wondering if anyone else has any theories because I would like to nip this in the butt and we have done all we can think of and have narrowed it down to the ejector and next time I am at his place I will mention something about the shims if the ejector replacement doesn't work.


And yes, the gas is in the on position :p


Any help is much appreciated!
 
Turn your gas system on and check to see if you have aligned the gas hole in the barrel with the gas hole in the gas cylinder.

Scott
 
m39a2 said:
Turn your gas system on and check to see if you have aligned the gas hole in the barrel with the gas hole in the gas cylinder.

Scott
Click to expand...

Will do, unfortunately I am away working so I won't be able to get to the rifle just yet. Is there any tolerance for lining up the two holes? Do they have to be exact or can they be a little out? Etc. I kinda wondered if shimming the system affected it that much.
 
You guys would amazed at how many frustrated CGN'ers have over the years, sent me malfunctioning rifles to work my magic on. On so many of them I found that by blindly following common internet advice to shim. They did so and caused a gas port alignment problem.
You want. 1/16" drill shank to pass clear into the barrel from underneath cylinder.
 
45ACPKING said:
You guys would amazed at how many frustrated CGN'ers have over the years, sent me malfunctioning rifles to work my magic on. On so many of them I found that by blindly following common internet advice to shim. They did so and caused a gas port alignment problem.
You want. 1/16" drill shank to pass clear into the barrel from underneath cylinder.
Click to expand...

I'm gonna laugh and update this thread the moment I try to pass that 1/16" drill shank through and it's likely out of line.

How does one properly shim the system?
 
I had the same worries
my gas system was perfect, I check 20 times
I have everything disassembled, reassembled, cleaned, greased
nothing to do
everything has to work perfectly when i exchanged the bolt with another bolt
what for ??
I do not know, but now everything works fine

Sage EBR Chassis
Norinco receiver + barrel lrb criterion 18.5 assembled 45ACPKING
Prepared by trigger 45ACPKING
 
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