Most systems will fit adjustable feednecks. The only major size differences are .50 caliber hoppers, and the tippmann cyclone hoppers, which have very large feedholes.
No, all paintball hoppers have a standard neck size.
No. Hoppers meant for the cyclone feed will only fit the cyclone feed.
Not at all compared to actual paintball guns.
No, all (modern) hoppers have a standard feed neck size and will fit onto any gun (except for cyclone feeds).
sorry i do not know
Yes, all brand paintball guns use a tank or other source of pressure.
All paintball guns, excluding high end guns, have a .685 bored barrel.
Regular .68 caliber paintballs, all standard guns do. Also there is no "m16 paintball gun" , only guns that look like it.
.68. Almost all guns are this caliber.
all paintball guns run on gas. some have electric triggers so they can shoot faster.
Yes. A paintball gun is not considered a firearm therefore a felon can purchase a paintball gun in Texas.
On most if not all paintball guns you would have to pull the trigger with the safety off.