Action Army AAC-C1 Teflon Shim for Piercing Nozzle

The piercing nozzle is where a CO2 cartridge gets opened, and the instant it does there is nothing between full cartridge pressure and the outside world except whatever is sealing that joint. A shim that has gone hard is how a cartridge empties in one go.

Teflon is used here for the same reason it appears elsewhere on this rifle: it holds under pressure and does not deform into a leak. Beyond the code, the name and the material, nothing else about it is documented.

Cheapest insurance on the rifle.

Specifications

Good to know before you buy

If a cartridge dumps on piercing, look here first. It is almost always the shim and almost never the nozzle.

Keep a spare. This is a part that fails without warning and takes the rest of the day with it.

It is a shim, not a ring. Action Army list three teflon parts for the Athena and this is the flat one for the nozzle.

No dimensions are published. No description is published for it; Action Army give only a code and a name.

Frequently asked questions

What does the shim actually seal?
The joint at the piercing nozzle, where the CO2 cartridge is opened.

Why does mine keep leaking?
A hardened or distorted shim is the usual cause. They do not last indefinitely under that pressure.

Is it the same as the other teflon parts?
No. Three parts, three positions, three codes.

How many come in a pack?
It is listed as a single shim.

Can I reuse one?
You can, but given what it costs against what it protects, there is no sense in it.