A CO2 airgun is about as low-maintenance as a firearm gets. There are no powder residues, no carbon fouling, no primers. But low-maintenance doesn't mean no maintenance — and the cowboys who treat their airguns like they're self-sustaining will eventually find one that isn't.
The three things that kill CO2 airguns prematurely are all avoidable: leaving CO2 cartridges installed long-term, using the wrong lubricants on seals, and storing guns somewhere hot. This guide covers all of it in plain terms, no gunsmith degree required.
What You'll Need
- — Silicone oil — specifically for CO2 gun seals. Do NOT use WD-40, gun oil, or petroleum-based products on rubber seals. They will destroy them.
- — A bore snake or cleaning rod with patches — for occasional barrel cleaning
- — A soft cloth — for external wipe-down and keeping the finish clean
- — A cool, dry storage location — not the garage in Florida summer
CO2 Cartridge Care
The single most common CO2 airgun mistake: leaving a partially-used cartridge installed between shooting sessions. A small amount of CO2 will leak past the seal over time, and more importantly, the constant pressure on the seal degrades it faster than shooting ever would.
Best practice: run the cartridge as dry as you can at the end of each session, then release the remaining pressure by dry-firing into a safe direction until nothing comes out. Remove the empty cartridge. Store the gun unsealed.
Before installing a fresh cartridge, put one drop of silicone oil on the tip of the cartridge. When the cartridge pierces, that oil coats the seal and keeps it supple. Do this every time. It takes one second and extends seal life significantly.
Barrel Cleaning
CO2 airguns shooting BBs or pellets accumulate lead and steel residue in the barrel over time. This doesn't need attention after every session — but every few hundred shots, a pass with a dry patch followed by a lightly oiled patch will keep accuracy consistent.
Use a bore snake sized for your caliber (.177 or .22) and pull it through once, breech to muzzle. That's it. Don't over-clean — a light film of oil in the barrel is protective, not a problem.
Storage and External Care
Heat is the enemy of CO2 gun seals. Storing airguns in a hot garage, a car trunk in summer, or direct sunlight will degrade rubber seals faster than any amount of use. Store guns indoors, at room temperature, away from humidity.
For external metal surfaces — especially on guns with real steel components — a light wipe with a silicone cloth after each session prevents surface rust and keeps the finish looking right. For grips, a light coat of the appropriate wood or synthetic conditioner once a season is enough.
"One drop of silicone oil per cartridge. Remember that and you'll never have a seal problem."
Troubleshooting
Gun leaking CO2 on install. The face seal or pierce seal is worn or damaged. These are replaceable on most guns — check the manufacturer's parts list. In the meantime, a drop of silicone oil directly on the seal face sometimes solves a minor leak temporarily.
Velocity dropping mid-cartridge. Normal — CO2 pressure drops as temperature drops or as gas volume decreases. If velocity drops sharply after only a few shots, you have a slow leak. See above.
Trigger feels gritty. Dirt in the action. A can of compressed air through the action followed by a light mist of silicone lubricant usually solves it. If it persists, the gun needs disassembly — which is a manufacturer-specific job outside the scope of this guide.
A well-maintained CO2 airgun will outlast its owner's interest in it, which in the case of the backyard cowboy, is saying something. Treat it right and it'll be out in the yard with you every afternoon you choose to show up.
The Backyard Cowboy
March 13, 2026