The JD 4230 is a late 70's vintage, 102 hp out of the factory, 2 wheel drive tractor. It is considered small by today's farming standards. It does have a Soundguard cab with a/c and heat but inevitably dust does get in. I do not put tape on the muzzle when on the tractor but I do sometimes tape the muzzle when on my quad or walking. I also have a JD 4040 which is an early 80's vintage which is equipped the same way.
Making hay while the sunshines is an old adage that is very true. A level of personal judgement is required when to stop the equipment and shoot at a critter. For the most part the rifle is for coyotes, skunks, porcupines and ravens. We have found it is necessary to keep some pressure on them or the populations run out of control. We are currently plagued with skunks.
I deliberately turned the installation bolts around to put the nuts on the inside of the cab. The bolts sticking out are not an issue as I never make contact with them and I didn't want them sticking out in the wheel well in case I run chains.