I'll do my best to describe how I went about shortening the length of pull. Not difficult, just a little tedious and worth the effort for me. Yes, the work does look a little crude, but when complete an reassembled, none of the cuts can be seen.
First step is to completely disassemble the stock. In the next 2 pics you can see an overall length measurement to show for reference where the stock started and where it ended up.
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and the next pic you can see where I have marked the sliding section to be cut to get 1/2" - 5/8" reduction in LOP. Notice where I marked it with a sharpie....
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More to show where I cut the sliding piece.....if you look closely you can see where I marked with a sharpie.
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View after cutting the serrated part to length to allow it to move further inside the stock body....
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Next pics show areas on the outer stock halves that need to be removed to allow the sliding part to move further back...
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Hope this helps.