That's quite a slow firerate! Also that's sight overbore if I ever saw it! That Russian optic looks wack on the M16! Oh and welcome back. Took you long enough. EDIT: Read the replies
That is THE ROF. Perfect. Sounds like a pig, but with small bullet. I saw you mention the leak, but it cycles fine. So I gotta ask.. Buffer, spring? Any other weird witchcraft?