What I'm talking about.. you mean with the front retaining pin?rmm.. I descibe the problem in detail somewhere in another thread. I'll dig it up in a bit if you can't find it.
The cavities are for your cleaning kit and combination tool.
Combo tool, chamber brush, and oil/grease bottle in the top hole.
segmented cleaning rod and bore brush in fabric pouch in bottom hole.
Fred's has the whoel kit'n'caboodle for around $18, I think.
-K
gaah.. in the archives, I don't explain it any better than I do here. So here we go again.
You already see the inletting in the right rear of the stock, under your windage knob. This is for the auto selector, and you'll need to fill it in. (I've been recommended to use JB Weld -- worked like a charm).
Anyhow.. up front, right at the end of the inletting on the starboard side of the receiver, there's also some loose space inside. This can be a problem when.....
Oh heck. Dissassemble your rifle.
Pull out the action, and turn it over. You see where the oprod is held in place with a spring, mounted over an oprod guide? Now, see down near the receiver, where the oprod guide is based in a notch in the receiver? A little rod, maybe 1/8" in diameter is holding that op rod spring guide rod into place.
See how that little rod can be moved laterally, and if you move it far enough, the op rod guiderod will come loose? This can bang your mag and will definately jam up your rifle if it happens in firing.
NOW.. here's the problem. That little rod can work loose under firing. The stock should be flush to both sides of that receiver block, to keep the little rod from working loose. The USGI stock does not do this on a Polytech receiver. So, you need to fill in the gap. JB Weld time again. Messy, needs to be dremeled down after it dries.. but worth it to prevent future agravation.
Make sense?
-K