Sold as a convenient pack of two, these green O-rings are an easy, budget-friendly upgrade for any gel blaster gearbox suffering from poor compression. Over time pistons and cylinder heads develop wear or small deformities that reduce seal quality, which in turn lowers muzzle energy. Replacing a tired O-ring with a fresh, correctly sized one restores the seal between piston and cylinder and often produces a noticeably firmer, more consistent shot — a big performance win for a very small part.

The green O-ring when combined with a upgraded spring will complement each other: the O-ring improves the air seal while the spring gives it more power. Key part for a basic upgrade.

Installation is fairly straight forward and there are plenty of tutorials on Youtube showing how to install new o-rings into gel blasters.

Remember that modifications are done at your own risk.