i'd try strippin it back down to the lowest level you took it to... see if the bolt works then...if not, make sure it's in the proper guide grooves in the reciever, and make sure the bolt handle is seated fully into the bolt.. check this by flipping the reciever upside down, w/o trigger group installed.. push down on the bolt, and see if it moves freely...wiggle the bolt handle a bit while pushin down on the bolt to make sure it's completely in it's proper slot...
if that's not it, i would guess you had a part failure of the main spring guide rod or retainer...
there just ain't that many parts in that area to cause it....
keep us posted
skintback