Pistol port block mounting guide rail holes.
Try this Darryl. I've measured as well as I can and it should be easy to follow.
A line drawn through the two upper hole centres is 2-5/16" above and parallel to the upper edge of the port cut-out.
A line drawn through the centres of the two forward holes is 1-3/4" forward of and parallel to the forward edge of the port cut-out.
The forward hole centres are 6" apart.
A line drawn through the centres of the two rear holes is 1-1/8" aft of and parallel to the aft edge of the port cut-out.
The rear hole centres are 5" apart.
Don't hesitate to ask if in doubt about any of this.
Dave
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Hell no! I'm not that old!
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