This wasn’t my idea , but I found it in the web somewhere... A great pellet and .22LR trap is a box filled with rubber mulch. The only cost is the mulch, about $15. I took a cardboard box about 3’ x 2’ x 1.5’ , filled it with two bags of rubber mulch, and inserted another smaller box and sheets of cardboard snugly in the open end to hold it all in. It is recessed about 8” to retain the paper and cardboard debris that accumulates while shooting. I attached a couple of clips on the top edge of the box open end to suspend targets. It’s very silent, all you hear is the gun report. The rounds just collect in the mulch. A std velocity 22 is stopped at about 12” in the mulch which is 2’ deep. I replace the retainer sheets of cardboard and inner box when pieces of mulch start falling through, maybe 1000 rds or so? I like having the paper targets suspended in mid air, you get nice clean holes in the target and a small flashlight at the bottom of the opening out of harms way makes them easy to see.