September 10th, 2013, 06:12 PM
Join Date: Jul 2007
Red sharpie permanent.
Flush and clean with alcohol and Q tips first.
PS: I checked over a NEW Springfield M1A Standard that had been returned for a GI bolt install because the owner did not want the Spinger cast bolt. Fresh back from the SAI service center, still un-fired, the GI bolt did give good head space, but the lug contact was not optimal. A few minutes of lapping was all it took to fit up nicely.
While we often refer to a GI bolt swap as a "drop in", spending a few minutes checking for proper bearing on BOTH sides, and/or lapping the lugs in for maximum bearing are often required. NOTE I said a FEW minutes of lapping ... you are not treying to adjust head space here, merely optimise lug to lug bearing.