12g Co2 Cartridges Adapter Instead of 88g or 90g Co2 Capsule, Co2 Quick Change Holder Compatible with Sig Sauer MCX or MPX

This is a soundly made, metal adapter. It even doesn’t leak when piercing the cylinder. However, in its first use, the small “piercer” jammed with the circular piece of metal which it had cut out of the cartridge cap. It took a bit to find thin and rigid enough wire to remove the jammed cone and force out the plug. That problem hasn’t recurred, over about 10 more cylinders. The biggest problem is the supplied O-rings (and it came with three, fortunately) absorb something from or react to air and/or CO2; after a single use they pop out of their ring around the piercer and cannot be replaced because they have expanded. In fact, they then are so large they can fit AROUND THE NECK of the CO2 cylinder. They are easily replaced (I bought some in bulk), however, and now the adapter is functioning well. We will see if the replacement O-rings also swell … my prediction is, no.