Homemade
DIY is not my thing , but I use an old half size plastic carbuoy - plastic barrel to you and me - its only a short one so easy to handle - has a clip on lid and a locking collar .
Over time I have dispensed with the collar and even the lid that I cut a circular hole out of .
I prop the barrel on its side and filled it with breeze blocks - then after a while was wondering what was whizzing past my head after each shot
(I may be a numpty but I lways use eye protection ) . My .25 pellets had 'holed' the blocks and they were bouncing off the back of bottom of the barrel .......
I now use old telephone books / catalogues etc with some blocks still inside .
Brilliant ....and after a bit easy to replace ..
" WHEN YOU'RE GOING TO SHOOT - SHOOT , DON'T TALK ! "