My Poly had the front sight leaning to the right as you are looking from the butt end and the cuase was the barrel was under tightened , to line it up is called indexing , with Hungrys close supervision

and the use of his barrel clamp and my vise the fix was very easy.
I replaced my sights with some of a Garand ($75 I think from Andy in Italy) as the windage screw was very sloppy and the aperature was not drilled in the center.I changed the op rod guide to a Rauch Tactical and added a Springfield Armory muzzle brake.I would like to chop the barrel and make it into a shorty .The Poly synthetic stock is pretty good but I first upgraded to a USGI in fibre glass ( big improvement ) and just recentlly to a Promag Archangel...so as Hungry said I now need to buy 2 or my #### will fall off....lol