I purchased an H&R Model M12 Target .22 from the CMP. Although this rifle came with a receiver sight base, it had no sights. I have since purchased a Lyman model 90 MJT receiver sight for this rifle. The problem is the attachment screw for the Lyman sight is too small for the base on the rifle receiver (8-40 attachment screw, base appears to be 10-24 or 10-32). To solve this problem, I purchased a Williams 540 base, which works great for the Lyman sight, but the holes drilled in the receiver are too far apart (540 - .420" compared to receiver - .600"). My question is which of the Williams' sight base has the same hole pattern as that drilled in the receiver? I cannot find any info on the dimensions of Williams' sight bases on their web sight or any other web sight. I would just use a larger attachment screw, but as you know, the Lyman sights are dilled and tapped to prevent the screw from being lost, and in order to use a larger screw would require drilling the sight which will be a last resort.
I have also sent this question to Brownell's technical department, but have yet to receive a response. Thanks in advance for any and all advice.
Cris
I have also sent this question to Brownell's technical department, but have yet to receive a response. Thanks in advance for any and all advice.
Cris