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Carefully slide the gas block towards the barrel shoulder, allowing for a .025” gap between the shoulder and the back of the block (use feeler gauges). This 308, 5.56, 300BLK, 7.62. It allows you to bleed off any unneeded gas, only allowing the amount you need to cycle your bolt. This results in less recoil, At the front of the gas block is a 15-position adjustment screw; turning it clockwise to. Position 0 will close it to zero gas flow. The Wilson Combat adjustable gas blocks are designed so that the shooter is able to restrict the gas flow and slow the cycling of the rifle.