Hydraulic Buffer
Hello! I have an Endine in my Stag mdl-1. It's been in for about two years. M4's seem to have a little more pop in the recoil than the longer one's. I can't really say that it improves things that much in semi. They say the rewards really come in full. There's a great site. NOKICK.COM. Check them out. Some other considerations are Muzzle break/flashsuppressor change can help enourmously. I went to the PRI/MSTN. It makes a world of a difference.
good luck!!
