No.
all triggers are adjustable and customizable, but it is illegal and dangerous to be done so by anyone except a qualified gunsmith.
No.
There were multiple bolt action rifles used in World War 2 on all sides. There were also semi and full-auto rifles used on all sides.
Short Magazine Lee Enfield. Hands down, the king of all the bolt action battle rifles.
No, however you are able to get a sniper scope for all of the bolt action rifles.
For MANY firearms (but not all) the sights may be adjustable by the user. However, in the case of a shotgun with bead sights, or a revolver with fixed sights, they are not adjustable. Some semi=auto pistols have sights that can be adjusted by a gunsmith. Most rifles will have a user-adjustable sight.
ALL OTHER THINGS BEING EQUAL- yes, the bolt action is typically a more accurate rifle. However, there will be exceptions.
Ithaca didn't actually manufacture the rifles, rather they imported and distributed rifles manufactured by Tikka in Finland. I believe these were all during the early to mid 1970s.
Not much we can tell you with no information. Some rifles are marked on the receiver (frame) some military training rifles have marking under the stock (remove stock to see)
Depends on what type of gun you are talking about. Generally speaking, few revolvers have safeties. Virtually all semi-automatic pistols and rifles do have them, and the majority of shotguns are now sold with a safety. Older lever-action rifles generally don't have safeties, and most bolt-action rifles don't either.
Considering the size of most pellets, there is not much of a reason for a large Bolt Action air weapon. But yes there are several bolt action pellets guns and rifles. An example is the Crosman 2240. There are several "High Powered" air rifles, PCP's, (PreCharged Pneumatic) that also use a blot action, The Benjamin Rogue 357 the Marauder and Marauder pistol all use a bolt action system. I own at least 5 or 6 bolt action air guns.
They are single shot (one shot and the operator must move the bolt manually), shoulder weapons. They may be magazine or clip fed and are generally available in a wide range of caibres from .117 to .50 and are chosen because they provide superior accuarcy to semi or full automatic weapons.