Hello; I just joined this group. I am new to air gunning at this stage of my life. I grew up around guns on a farm in Minnesota where we fished and hunted upland game when we had time. I will be asking some preliminary questions as I prepare to start plinking with the two airguns I bought: The Beeman R9 Elite break barrel in the .22 cal with a scope and the Diana Airbug CO2 pistol also in the .22 cal with a red dot sight. I was wondering if 1/2 to 3/4 inch plywood would be a good backstop for these guns? I will probably have some bales of hay in front of the plywood on which to pin paper targets. Can anyone tell me about the integrity of the backstop I am suggesting? Thank you....