I know I am not the first or only one to installed a cheek riser but I finally got my TacPro and installed. Dang Canada Post strike! A couple things, once measured 1 3/4" from the butt, a mark was made with Sharpie and I then used masking tape taped along the mark and square. I found this easier to see when placing the riser on the stock to clamp it in position.
I was going to drill a pilot hole first then go 1/4 bit but stopped, gave it some thought and that would probably place the holes too high and the riser bumps would sit off the stock so..rebit with 1/4 bit.
I got lucky, I drilled one rear hole first, flipped the SOCOM around and drilled the other side and hit dead center, no need to ream the hole, bolt when all the way through with ease. I the bolted on the riser using the rear hole as I drilled the front, still used a clamp though. Got luck again!
Placed the riser about center of the slots, shouldered the SOCOM and was dead center POA through my EoTech, the red circle ret is no longer sitting at the bottom of the glass, I can see the whole circle now. Absolutely happy.
I still have to run a stock pack so placed my Triad Tactical over the riser, a few adjustments with the velcro and now I snap up to my shoulder, red ret is dead center in the glass, happy I am.
Much happier than this!
This is the 10 round mag inside the stock pack, still loads of room, a 20 round will fit also but that is about it plus foam plugs and chapstick is about all.
Thanks for looking, hope this helps someone, if not, thanks anyway.