Black River Tactical gas block inserts and gas tubes.
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Yes, a 10.5" barrel will run fine with a rifle buffer.
No, you won't need to adjust the buffer weight because a rifle buffer is already the correct weight.
If your barrel is over gassed, contact Clint at Black River Tactical. He'll hook you up. The Easy Button is their EZTune gas tube.
I ran one for a time. No issues in my set up. Kinda cool for a minute.
PB