It actually will depend on the paintball gun you have. Typical markers do not need a cartridge, but a hopper (the thing on the top of the gun to feed in paintballs). Markers like the Tippmann TPX and the Kingmann Chaser and Eraser definitely need cartridge to hold the paintballs sense they are pistols.
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No. The majority of paintball markers can use any brand of .68 caliber paintballs. Some low end guns cant use high end paint without breaking and using cheap paint in a high end gun defeats the purpose. But any .68 caliber marker can shoot any .68 paint. The exceptions are .43, 50 and first strike paintballs which can only be fired by markers designed to shoot them.
No, some paintball guns share common parts, but they are mostly different. All air/CO2 tanks and hoppers will fit all paintball guns, and regulators and macroline adaptors have standard threads which will fit if you have a regulator port. All barrels and some feednecks have different threading which means they can only go with certain guns. Any attachments with mounts must go with the correct size rail. ASA's have either straight or staggered holes.
No, all modern paintball markers (with the exception of the kingman training and some rap4 markers) use .68 caliber paintballs.
No some brands fly better, but a .68 cal ball is a .68 cal ball no matter who makes it.
No, they will either not fit the barrel, or not get enough air behind them to properly fire, along with jamming because of multiple balls in the chamber.