There is a bore brush designed specifically for the M203 (and can also be used with the newer M320, presumably). However, they tend to be a bit uncommon, and you usually end up cleaning them with simple rags and brushes.
Solvent and a M203 Bore Brush for 40mm.
Wooden clarinets DO NOT have to be cleaned with bore oil. I have had my clarinets for eight years and have never used bore oil on them. It is a waste of time and money. Any reputable clarinet repairman or clarinetist worth his salt will tell you that bore oil is a waste of time and unnecessary.
Chamber or barrel.
Chamber
From the factory, they are a signalling device and are therefore not a weapon at all. You can however register them as a large bore destructive device which allows you to own anti personel munitions with said launcher. If you attempt to possess a non registered launcher and anti personel munitions for said launcher, it is a federal offense.
no, small bore ,big combustion chamber you want big bore small chambers
Upper receiver
It has a chamber that stores air, until released, that propels a projectile down the bore.
N0- highly dangerous. The bore is also a different diameter.
Use full bore for applications where pressure drop should be minimum (such as in the suction pipe of a pump with required NPSH very close to available NPSH), or for pipes which could be cleaned with a pig (so that the pig doesn't get stuck on the valve). In other applications a reduced bore should be OK.
The cylinder. When you "Bore Out" an engine block, you're making the combustion chamber wider to accommodate larger pistons to increase horsepower. That's usually mostly done in drag racers, not much use for it in a street car, unless you like supportin' the local Policemans Ball.
Stevens 30 caliber rim fire is not a true 30 caliber. Chamber is .296. Bore .270 t0 .277. I found a 30 caliber rim fire round, at a gun show. It did not measure out to a 30 cal. Shot shooter