UX Magazine for Strike Force Semi-Auto CO2 4.5mm BB Air Rifle by UMAREX
£62.99
Designed purely for the Strike Force Semi-Auto CO2 4.5mm BB Air Rifle by UMAREX, this mag is a single 30-round 4.5mm steel BB magazine that also houses the 2x 12g CO2 capsules for repetitive fun its best to have multiple of these so you spend your time shooting and not having to reload your magazine adter each barrage
It is recommended to remove the CO2 capsules prior to storage - do not leave pressured CO2 in the gun for long periods of time as this will cause damage
Quantity
Out of stock
Gun Safety & Care for CO2/Gas-Powered Guns
Important — read before purchase or storage.
All CO2 and green‑gas/propane powered guns and magazines are pressure systems and must not be stored pressurised for any length of time outside active shooting. Leaving gas installed will compress internal seals, accelerate permanent leaks, and shorten the life of your gun.
Temperature & Pressure Behaviour
CO2 and propane are temperature‑sensitive: they expand and contract with temperature changes. That expansion can force gas past worn seals or, in extreme heat, rupture seals or valves — creating dangerous failures. Keep guns and magazines out of direct sunlight and away from heat sources. Cold temperatures reduce pressure and can cause low power or feed problems, so always test a gas gun in the conditions you intend to use it.
Always remove or fully vent gas after use. If you’re not shooting, remove the CO2 capsule or vent/empty magazines. Do not store with gas installed.
Lubrication Recommendations
To protect internals and seals we recommend using gas with added lubricants:
-
CO2: use lubricated CO2 capsules — UMAREX branded CO2 is our recommendation.
-
Green Gas / Propane: use gas with added lubricant such as Vorsk, UltraAir, Nuprol, or Abbey (Green Gas).
Seal & Lubricant Guidance
-
Apply one drop of silicone oil (for polyurethane seals only — usually green or clear seals) to the tip of every 5 CO2 capsules or before long‑term storage to lubricate the piercing nozzle and protect seals.
-
For silicone seals (typically semi‑translucent white), only use PTFE‑based lubricants (e.g. Super Lube PTFE). Do not use silicone oil on silicone seals.
-
Never use gas cartridges showing rust or visible corrosion.
Leak Expectations & User Responsibility
All gas systems will slowly leak over time. Proper care reduces the rate of leakage but cannot prevent it entirely. Leaving cartridges installed dramatically speeds up seal wear. By using or storing gas guns you accept responsibility for regular maintenance, correct lubricant use, and safe storage.
We Test Before Sale
We test every gas‑powered gun prior to dispatch or handover for major leaks and function. This may mean the gun arrives with gas installed — you may choose to use this free gas or vent the gun before storage. Testing does not guarantee seal life or prevent future leaks; seals remain consumable parts.
If you’re unsure about seal types, lubricant compatibility, or safe storage, ask us before purchase — we’ll give honest guidance. Failure to follow these recommendations may void warranty or return eligibility where damage is caused by improper storage or lubrication.
Related Products

More Than Just Marketing Waffle
Our blog isn’t written by someone who’s never held an air rifle. It’s built from real-world experience, hard truths, and occasionally a well-placed rant. That’s why shooters across the UK actually read it.
Whether you’re after solid buying advice, after-sales guidance, deep dives into industry trends, or a look behind the curtain in Behind the Barrel, our blog is here to inform—not just to sell.
-
🧠 Guides & Advice – From zeroing your scope to choosing the right regulator.
-
🛠 After-Sales Know-How – Real support, not copy-paste manuals.
-
🎯 Staff Picks – The gear we rate (and we’ve tried it all).
-
🗣 Behind the Barrel – Less brochure, more brain—history, opinion, and industry talk.
Join 20,000+ Readers Who Actually Want to Know What They’re Buying
Get notified when we post something worth your time.
No spam. No fluff. No sponsored nonsense.





























