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40 Cailiber Conversion Kits- Convert your Marker to 40 Cal. You can buy paint ( normaly used in blowguns) and buy the rubber shell casings. Cheaper than the 43 Cal if you buy in bulk and buy alot. 40 Cal users report a better clip to cylinder ratio. About 9:1 instead of 8:1. Clip size is still limited to 20 rounds. Some people swear by 40 Cal some hate 40 Cal. I really don't have the money yet, its low on my list.

Improves on base model by lowering the cost of paint, the more you play the more you save,
The "X" Conversion Kits - Give your Marker the Air Force feel by turning it into an "X" version. Even more compact that the Commando; I have seen this kit used to back up snipers. Like the ARMY's SPR, "X's" are compact and accurate. Add a scope and your set for a good step up in the support role.

Makes for a great weapon if your buddy is carrying the long range stick. With the bling bling this would also make a sweet secondary Marker.
Cylinders
1.6 0z (45 g) Standard RAM CO2/N2 Tank - Simple here, CO2 Runs out faster but N2 is more expensive. Depends on your taste. Rule of thumbs for tanks, carry twice what you need.
Magazines
Standard 20 Round Mag - you need em, plain and simple. Right now this is it. Rule of thumb, carry three times what you need.
Fabric Mag Holders - Don't get these. They will lose their grip on your mag when you need it the most. If you must have the clip holders go metal!
Metal Mag Holders - Used for fast reloading by straping two mags together. The clamp is well made and will stand up to the elements.