Gun smith, Brownell's
50-100 USD
ya it will give it more accuracy and a little bit more velocity
No such gun. Mark III is the most recent model.
The diameter
The bore of a gun relates to the diameter of the hole in the barrel - and in turn the diameter of the bullet the gun can fire.
I can't do a barell roll, sadly. I only can do a barrel roll. :D
Go to the Chinese BC (That is at the bottom of the time traveller) just walk right and you will see a barrel. The barrel is the gun power.
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bore diameter
In the James Bond movie "The man with a Golden Gun" stunt driver Bumps Willard performs a barrell roll driving an AMC Hornet.
Caliber "Caliber" is a word for the diameter of the bullet or the bore of the gun.