When I was stationed at Ft Indiantown Gap a LONG time ago, I had a little Dixie-style "country rifle" in .36 caliber.
According to the (then) Post Regulations, a BP firearm wasn't "a deadly weapon" & could be legally fired in the cantonment area.
(And as the groundhogs did a LOT of damage to the building foundations, we BP hunters were "invisible" to the DoD Police, too.)
LOTS of groundhogs there & we ate a lot of BBQ young groundhog, too. = TASTY.
yours, satx