Does anybody know of a supplier of 6×32 unc, & 5 x 40 & 4 x 40 unc bolts, (this might sound a tad pedantic) nickel plated brass or stainless raised countersunk slotted screws ? I am restoring a ex army bc312 american receiver. The last time i had this trouble was restoring a 700cc royal enfield, nobody at the time heared of phillister head bolts.