On Manners stocks, there is a plate attachment, that can be installed by Manners for $29.
That stock plate attachment has 2 screw holes in it, to attach spacer plates. to increase the Length Of Pull (LOP)
There will be screws through the butt pad, that hold any where from 0, up to 4 of these spacers.
Since my LOP is over 15 1/2"...I need stock spacers