[Slamfire]

I looked at Grainger and I couldn't make up my mind on which one to get!

I bought the stuff in the green can. And it works well.

Which mold release would you suggest? THere are different chemicals for different applications.

Here is something that might provide guidance.

http://www.mann-release.com/prodgude.htm

Also, if I use a commercial mold release do I still need to fill the voids in my receiver with modeling clay?

If you plan to permanently glue your receiver to the stock, don't use the modeling clay. Otherwise, to keep glue risers from working their way into the nooks and crannies, yes, use modeling clay.

Back in the days when the M1a ruled the firing line, I heard of people who glued their actions into the stocks. When the barrel needed to be replaced, they busted the stock off.

I always thought that was crazy.