Too broad to answer. At what range? Rifle, rimfire, pistol, revolver? In general, a heavy barreled target rifle (most are custom builds) in one of the 6mm target calibers would be the most accurate to about 600 yards, but other rifles such as the .338 Lapua will be more accurate at 1500 yards.
Telescope
Both can be equally accurate
Blue Book of Gun Values
The question can't be answered as written.
Super soaker 8000
The most inherent accuracy will be found in bullseye target guns, such as a Smith 41.
Have it checked by a good gunsmith
Generally, a telescopic one. Like a scope on a Sniper rifle
I prefer the P90 sub-machine gun because it is accurate and has 50 rounds in one magazine. P90 Rocks!
No.
The UMP45 is the strongest, and most accurate smg in the game. I Agree Also.
Accurate by whose standards? No BB gun is really very accurate, but within about 10 feet they can have a good group.