You can rig up all sorts of target traps...but the best setup I've found so far is:
Collect your paper/cardboard recycling (I have 2 kids...the amount recycling they produce is stunning) and stuff it into a bag.
Stuff the bag into a box (we have plastic grocery bins which are of a very handy size).
Tape a target to the box so it's over the bag (taping to the lip of the box works....but running two stripes of duct tape across the box and then taping the targets to them works really well).
When you've blasted the bag to pieces you can either just bag it with another recycling bag or pitch it into the trash.
A bag full of paper/cardboard soaks up BBs really well, any spill over/tricklers end up in the box, easy to dispose of, etc...
I ended up working on a few SAWs at once and the stress testing of the setups ended up depleting my stash of BB's...at the end of it all the bag was pretty much shot through and there was A LOT of BBs in there. I just bagged it again and tossed it in the blue bin.
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