no
They are just as accurate as any other power system in air guns. A lot of it has to do with the design and length of the barrel. Rifles barrels are much more accurate than smooth bore barrels.
The use of damascus barrels on guns began to decrease pretty rapidly after 1900, although they were still fairly common up until the start of WWI. If you have a breech loading gun with damascus barrels it will probably date from 1875 - 1910. Most damascus barrels on U.S. guns seem to have actually made in Belgium. There is a lot of debate as to whether any damascus barrels for shotguns were actually made in the U.S. It seems likely there may have been small numbers produced in the U.S. However, Belgium had a large gunmaking trade at the time, with a lot of barrel makers specializing in damascus barrels, so it was generallly cheaper to import them than to make them.
No
Any of the Tippmann/BT4 guns have the most aftermarket parts. not only barrels, internals and electronics, but outer grips, shrouds and other aesthetic parts.
a mortar has such a short barrel due to the fact that mortars are released from barrel at lower speed than cannon guns thus the need to rifle them and have long barrels is useless and so the tube does not need to be any longer than whats required to stabilize the flight and direction
The earliest guns were hand-made. Barrels were cast (later forged and drilled) and finished with hand files, stocks were carved from wood with hand tools. Eventually, guns started to be mass produced in factories using the same techniques as any other machinery - milling, stamping, turning. Later automated machines came to be used for rifling barrels. There is also a special machine for mass-producing stocks that duplicates the shape of a single model on several pieces of wood at a time.
On the ends of every barrel there are "threads" These are different for every series of guns. The Salvo marker has Tippmann threads therefore any Tippmann barrels can be use. Smart Parts also makes barrels for Tippmann markers. Actually the Project Salvo is a Tippmann 98 with a different body. It uses Tippmann 98 threads and any barrels that fits the 98 will fit the Salvo. The Salvo can use a A5 barrel if you add a 'A5 to 98′ adapter to convert the threads to the 98 style for your Salvo.
Any Spyder threaded barrels.
For the most part a handheld gps is the same as a navigational GPS. The only difference is the size of the product and the price. A handheld GPS receiver is handheld just like the name, while a navigational GPS could be any size.
Any object that rotates has a tendency to continue rotating.
If I'm understanding the question correctly...no. Only PSP games will work in the PSP. Vita (or any other handheld system) games will NOT work.
I'm not aware of any shotguns ever made with two barrels twisted together. If you are refering to "Damascus Twist" barrels, you need to learn a lot more about guns before buying one. Here is some information for you...please note the part about it not being safe to fire a Damascus barrel with modern powder. Picture an onion after a fire cracker went off inside it. http://www.hallowellco.com/damascus_twist_barrels.htm