Rifle Gas Ejection/Lock Back/Gas Issue

[Clint]

A 20" rifle with a mill spec port will just run.

Assuming the port is good, it's likely the adjustable gas block is leaky.

Try a quality non adjustable gas block.

Something like this.
http://www.blackrivertactical.com/co...tegory=6464008

[swampfox44]

Port measured .087", drilled it out to .0938". Still same result, failure to lock open at full gas. I've got a new standard, non adjustable GB on the way.

[jpmuscle]

So before doing anything else you went and drilled out the port?


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[TomMcC]

Port measured .087", drilled it out to .0938". Still same result, failure to lock open at full gas. I've got a new standard, non adjustable GB on the way.

My man...even though the port was under spec, we dont remove metal as a first resort. It might have worked with a fixed gas block. Always start with the less intrusive possible fix first.

While we're waiting for that new gb... does the bcg move freely in the upper, without any binding all the way from fully locked to fully retracted?

[Wake27]

So before doing anything else you went and drilled out the port?


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[TomMcC]

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Had to look that up....pretty funny.

[Todd.K]

The correct port size for a 20" rifle is well known, it was fine to fix it.

PMC Bronze not running in rifle length gas systems was a well known issue.

[Clint]

PMC Bronze not running in rifle length gas systems was a well known issue.

Good info from a while back:

https://www.m4carbine.net/showthread...C-ammo-problem

[Pappabear]

Dare I ask what mag was being used ? And did you try multiple mags , pmags , lancer , 30 rounders?

PB

[26 Inf]

Had to look that up....pretty funny.

Ditto, pretty good.