Quote:
If you use a handguard with a cap the cap forces the gas block forward another .033" unless you use a FSB with a hole at .265" from the rear.
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This would also apply if the barrel was made for using an M4 style HG and you went free float. I've had a similar issue on a LR308 barrel that was made for an M4 style HG and I installed it into a FF. I had to space the gas block forward of the barrels shoulder to fully align the ports. It went from short stroking to way too much and I had to get an adj gas block...