Fixin' to build one, but I always over build everything.

I just want to shoot everyday.

build a 12"x12"x12"( or larger) plywood box, leave 1 side open and fill the box with rubber mulch( available at Lowes). over the open side, staple a piece of cardboard and staple/tape targets to it. when the cardboard is shot out, replace it. the rubber mulch will absorb the energy of any pellet and is very quiet

I built one of the duct seal jobbies, but Jerry's solution sounds better, faster and cheaper.

yes, the rubber mulch is much cheaper than duct seal but they are both quiet