The ZM51 features a Full Nylon External Body with ABS Plastic Magazine and Trigger and Bolt. It comes fitted with a 55cm plastic inner barrel with a 7.5mm ID. It has a 1.25mm long Spring (Not Compatible with other springs as the spring OD is different)
The most suitable Hopup for this blaster is the Rizer Hopup (Coming soon to Online)
When soaking the gels, they need to be soaked fully submerged in warm water from the tap for a minimum of 4-6 hours.
Once they have fully grown you can leave them in the water and keep them in or out of the refrigerator.
When you are ready to use them just drain of any excess water with a strainer before you feed them into the mag but do not dry them as they need to be lubricated to work properly.
DISCLAIMER - Do not alter any part of your toy gel blaster as this will void the warranty. Upgrades and alterations refer to pulling any of the blaster apart or opening it up, changing springs or upgrading the battery from 7.4v to an 11.v battery.