Some buffer questions

[SDW]

Really appreciate the discussion here.

To SDW's point, this rifle runs well with its factory parts (carbine buffer and spring). It does have an adjustable gas block, which I've experimented with a bit, but maybe some additional adjustments through its whole range might be worthwhile.

The reason I mentioned it is because in your other thread about receiving your upper you said you are/were not getting full lock-back sometimes. If that's the case then your rifle might be a little under-gassed for various possible reasons, or it doesn't like the heavier buffer and 'aftermarket' spring, or a combo of both.

And of course if it is under gassed, IMHO there's no point in experimenting with the gas adjustments on the gas block. You'd want to open it up all the way and get all available pressure coming up through the barrel's gas port. 'Cause at the risk of stating the obvious, AGBs can only reduce gas pressure. They can't magically amplify it.