I take the weights out of regular carbine buffers and tune the gas blocks to your loads. You want lightweight carriers not heavy. Taccom sells one but removing the weights works fine
+1
Adjustable gas block, light weight bcg, empty carbine buffer will run just fine in my experience as well. I think I'm running a Sprinco Yellow (reduced power) spring as well, if I remember right. All the gas tuning is done with the gas block, as badwolf says.
