Paintball marker guns and paintballs and accessories, namely, paintball ammunition; projectile feeders; rear velocity adjusters; regulators; side and rear cocking systems comprised of cocking handles, drive springs, and linkage arms; sight rails; stocks; trigger upgrades; barrel adapters; barrels; barrel sleeves; drop forward/tank adapters; expansion chambers; low pressure kits consisting primarily of volumizers for increased air capacity, reduced weight rear bolts, and reduced tension drive springs; fire power upgrades; grips; cases; o-rings; butt plates; barrel cleaning systems comprised of flexible rods with cloth swabs, pivoting rubber discs used to clear broken paint and residue and condensation from barrel; grenades containing paint or colorant; paintball marker power supplies, namely, nitrogen accessories, co2 tanks, nitrogen tanks, and replacement parts therefore