I have a SAI M1A Socom 16 and a question. To those with SAI M1A's, is the spring recess for the bolt lock centered between the two lugs on your receiver or is it off-center? The spring on mine is not straight up and down, it leans to the rear. The recess is a little closer to the front lug. SAI said it was normal, I do not believe them. Can anyone advise if theirs is the same?