300 BLK problems

Hey guys looking for some advice. Took my 300 blk 16" carbine gas with standard buffer and FA BCG out. Noticed it would not lock back after final round 50% of time. Also seems like it's short stroking. The casing from the fired round would not eject and would still feed another round. That happened probably around 6 out of 30 times. I was shooting some ammo from good to go, it's a 147gr. Non suppressed. Any ideas?

Try some 110 or 125 grain stuff. Or maybe open the gas port up a bit? Or try a non-FA carrier?

What length gas system?

Find some factory supersonic ammo and run it through first. If it still malfunctions, then we could give you more accurate advice.

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Originally Posted by Hoser

What length gas system?

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He says it's a carbine length.

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Originally Posted by ray1970

Try some 110 or 125 grain stuff. Or maybe open the gas port up a bit? Or try a non-FA carrier?

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Thanks Ray, got a semi bcg from another build I'm gonna switch

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Originally Posted by KS63

Find some factory supersonic ammo and run it through first. If it still malfunctions, then we could give you more accurate advice.

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Picked up some 125gr Remington premier otm from Bowers gonna see if that cycles better, I know that the other stuff was "practice ammo" was only rated at 1975fps out of a 18" barrel

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Originally Posted by ray1970

He says it's a carbine length.

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+1

And make sure the BCG is nice and wet. Next step will be to check your gas system from stem to stern.

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Originally Posted by ray1970

He says it's a carbine length.

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Right there in the first post. Yes I am a dumbass.

You might want to try a semi auto carrier and check the weight of your buffer.

If it wont run with the Remington 125s, there is other issues.

My friend had this happen on his 300blk build; he had to open up the gas port hole on the barrel to fix it.

What size buffer and spring is best for the carbine length gas system in a 16" barrel chambered in 300BLK? Can you expect it to ever run all kinds of ammo from 110grain to 220gran subs?

Carbine length gas is going to be real difficult to get subs to run reliably, pistol length works much better in that regaurd. That said, if you open up the gas port on the barrel, you should be able to get it there, but it's going to be slamming the action pretty hard with supers after doing so, I'd recommend an adjustable gas block to make it tunable for the load.

I used standard carbine buffer and spring in mine and with the pistol length gas system and an adjustable gas block it runs reliably with both subs and supers.

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Originally Posted by belizejet

What size buffer and spring is best for the carbine length gas system in a 16" barrel chambered in 300BLK? Can you expect it to ever run all kinds of ammo from 110grain to 220gran subs?

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That needs a standard carbine buffer (3 oz) and spring . Yes it should run all types of ammo, but subs will need A1680 powder to cycle unsuppressed. Other powders probably wont generate enough gas to cycle at sub velocities.

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Originally Posted by 20X11

That needs a standard carbine buffer (3 oz) and spring . Yes it should run all types of ammo, but subs will need A1680 powder to cycle unsuppressed. Other powders probably wont generate enough gas to cycle at sub velocities.

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1680 is the only powder that I get reliable cycling of my subsonic rounds. I have a carbine length gas system slightly opened up. Other than the subs it chews through everything without a hitch.

got it fixed now, SA bcg along with the BCM extraction upgrade kit and she ran great using all sorts of Super sonic ammo