hey your nto far from ft sill are you? Most army bases have a do it yourself shop, You should see if one of the soldier mechs would do it for you for 2-300. or less. It would be pocket change for the troop and a discount for you. 500 is avg price but I wouldnt pay it. Disregard since your already done with it LOL
As far as the gun, I know alot of people who get about that many rounds downrange and begin to 'compensate' for recoil, they end up pushing forward on the weapon anticipating the blowback which in turn has them shooting low, just a though
As far as the gun, I know alot of people who get about that many rounds downrange and begin to 'compensate' for recoil, they end up pushing forward on the weapon anticipating the blowback which in turn has them shooting low, just a though