SLR Sentry 6 .625 Adjustable Gas Block w/.400 in. Set Screw Spacing Black SA6-SM. 400 inch Set Screw Spacing. Note- If you have a barrel with no dimple or one dimple under the gas port either our .400 or .450 set screw spacing blocks will work fine....
SLR Sentry 6 .625 Adjustable Gas Block w/.400 in. Set Screw Spacing Black SA6-SM. 400 inch Set Screw Spacing. Note- If you have a barrel with no dimple or one dimple under the gas port either our .400 or .450 set screw spacing blocks will work fine....
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