HK Quick Change 12g CO2 Cartridge Adapter with 88g or 90g Capsule Threads Bottle for SIG SAUER MPX and MCX Air Gun Rifle

Bought for my Sig mpx as I thought it would be good to have in a 90 g bottle pinch.Works as it should, it gives you two ways to use..Put the m16 adapter in your gun then put the bottle in housing and then screw them into your gun and you won't lose any co2.Using it it only has enough gas to fire maybe 10 shots effectively then you might as well just throw your pellets down range lol..Also once the co2 bottle is empty it's cold and gets stuck in the housing as it expands or is forced to the rear of the adapter and wedges itself in..So for pellet shooting in a Sig I don't really see it's usefulness..I am returning it but it does do what it says.. mostly lol

This was purchased for a Sig MPX. The product arrived on time- overnight! It was nicely machined and anodized. I'm a machinist, and this is Impressive for Chinese product. It could use about another mm of length from the gun sealing surface to the hex, but did fit with minor interference with the receiver when screwed all the way in. The piercing nipple worked well and I got exactly one cylinder (42 shots) before running out of Co2. So far, so good. From that point on I could not get it to seal. My supposition is that the O-ring is made from material that will not tolerate the temperatures involved with Co2. It came with replacement O-rings, but I could not get it to seal again. I gave up after exhausting 3 cylinders. It's a shame because it is exactly the product I was looking for. I returned it.

Had to modify my mcx and had to tighten it down so hard that it doesnt even look factory made anymore do some research before buying i get about 20 shots for about 5 mins before all my 12g co2 cart is empty leaks bad also got frost bitten from the bad design of the air holes on the side it works but do research not worth 15$ maybe 7$

I was worried about early reviews but, the new design fits the Sig Sauer MCX perfectly. I lose almost no CO2 when loading a cartridge and I've experienced zero leak through 30 cartridges. It also comes with spare o rings which is nice.

The design of the Umarex Fusion 2 makes it hard to screw in, the concept seems to work, but won't be able to know unless I'm able to somehow get it fully screwed, don't want to permanently alter it to screw it in. If it were only two inches longer it wouldn't be necessary to make any changes to the Fusion 2.