Originally Posted by Constructor
If I was going to choose one I would choose one with a 1 piece carrier and a pinned gas block...
Its been about 3 years now that gas piston AR's have been on the market. Integral one piece impact shoulders on the BCG and double taper pinned gas blocks are pretty much the gold standard now.
Even the old Adams Arms retrofit kit has updated to double taper pins vs their old hex head bolt system of attaching. And Osprey no longer uses a gas key adapter/impact shoulder anymore. Everybody machines their BCG with an integral impact shoulder now. Dare I say...its standardized for the most part?