FWIW - I ordered some CPAP filters and adapters so I could filter the air flow; I didn't want to blow dust or sand into my barrel when I was shooting prone off the ground. The filter is already visibly darkening from the dust it's been catching from the Quantico ranges. I originally ordered one of these small air pumps, but it didn't put out enough air flow to cool a big barrel and suppressor, so I added more power. I cobbled together the adapters (because of the filter) and added a cut down case to fit the chamber. All credit to the person (I think in this thread) I stole this from.
Obligatory AI pic for the thread that was probably posted earlier: