If by med speed you mean the average speed, the average speed of a paintball shooting out of a barrel of a paintball gun is usually around 260-300 FPS. That is, if the gun is working properly. most fields only allow players to have their guns shooting at around 280 FPS, because shooting any higher than that can hurt somebody. The average field speed limit is around 180 MPH.
All paintball guns shoot between 280 and 300 fps.
Almost all paintball guns will shoot 300 fps.
First, Pellet guns don't shoot rubber balls, they just shoot pellets. But I know what you are asking. I believe you are asking about RAM (Real Action Markers) paintball guns. These guns shoot a .43 caliber paintball or Rubber ball, not the much larger .68 caliber paintball that is associated with Paintball games. RAM guns are used for training by the police and other agencies. They feel just like a real firearm and even have blowback when fired. Umarex co carries a line of RAM guns. See the link below.
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No. Paintballs are much MUCH larger than airsoft pellets (.50-inch and higher), the guns' feed mechanisms are completely different.
Anywhere from 18 to 35 shots is normal on most paintball pistols.
No, most fields won't allow the 6mm paintballs used in airsoft/paintball hybrid markers; definitely check with your field before bringing any.
If a military is not using simunitions, they use paintball. The negative feedback of getting hit and it showing along with the ability to use powder or water rounds make it a much better option than airsoft.
It all depends what you want to do. If you just want to shoot targets in your backyard, go get an airsoft gun, they are much cheaper than paintball guns. However If you want to play with people in a competitive game, get a paintball marker. There are nearly no "airsoft fields" and It is hard to play at any more than recreation because of the short range of the guns and the inability to tell you are hit with even thin layers of clothing.
Mostly all of the paintball guns made today are .68 caliber. Though with the recent changes in paintball some guns are being made with .50 caliber. Though by the year of this gun, it is 100% of .68 caliber.
A regular BB gun can not shoot air-soft pellets. BB guns shoot a .175 BB. Air guns shoot a much larger 6MM BB.
All paintball guns are regulated at around 290 fps, the model is irrelevant.