Crumple up newspaper to fill the bulk of the void, or foam if you have it. Then use PlayDough on the outsides. That way you don’t need to use 20+ pounds of clay! I strongly recommend using PlayDough, not modeling clay. Modeling clay is too sticky. Masking tape is fine for places you don’t want it dripping. You’ll also want to use a release agent on the parts…barreled action & such. And plug all the little vent holes & such in the Action with PlayDough also.
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