*UPDATE* Disappointing outcome - first time out with .308 build

[Black_Sheep]

First time out, it chambers a round using the charging handle but won’t feed a round from the mag. The bolt either goes into battery on an empty chamber or drags across the top of the next round and pulls it partially out of the mag and wedges open on top of the case. Spent cases eject cleanly at roughly 4 o’clock. Bolt does not lock back on an empty mag. I believe it’s short stroking. Looking for some troubleshooting guidance, any suggestions?

Details:
Aero carbine buffer tube, 3.8 oz buffer and spring - purchased as a kit
Aero NiB BCG - gas key is tight and well staked
Wilson Combat 16” barrel, non adjustable gas block and intermediate length gas tube
MagTech 147 gr M80 Ball ammo
Magpul pmag- both mags I tried were brand new

Thanks in advance...

[agr1279]

This sounds like a gas issue. What is the port diameter?

Dan

[Black_Sheep]

This sounds like a gas issue. What is the port diameter?

Dan

I will measure when I pull it apart this weekend

[themonk]

Try a heavier buffer

[Black_Sheep]

This sounds like a gas issue. What is the port diameter?

Dan

.075” the gas block was perfectly aligned

[matemike]

Can you pull the ch back and it locks open on empty mag? Rule out the mag and bolt release

[Black_Sheep]

Can you pull the ch back and it locks open on empty mag? Rule out the mag and bolt release

Yes, it reliably locks back on an empty mag.

Going into the range session I had the bolt dripping wet. After a half dozen attempts I pulled the BCG and broke it down for close inspection, reassembled it and hosed it down with Ballistol to the point that it was literally dripping. Still no joy.

After doing some research over the weekend I think there's a couple issues happening at the same time. One being the buffer is considerably lighter than it should be, the other is an undersized gas port. I have a heavier buffer/spring combo on order, I will try that before enlarging the gas port. I have a feeling it will need both to function properly.

[223to45]

Agreed, sounds like short stroking.

You will probably need to check gas block and make sure port is aligned.

Sent from my SM-G930V using Tapatalk

[themonk]

I may have misread your op. Does it lock back on an empty mag - load one round, shoot, does it lock back?

[Black_Sheep]

I may have misread your op. Does it lock back on an empty mag - load one round, shoot, does it lock back?

Does not lock back on an empty mag