Has anyone used a Magnospeed Riflekuhl?

[Bigeclipse]

I use one while testing. I actually like it, I am a firm believer in testing loads at barrel temps you plan to shoot at, and for that it helps.
Pull the filter and it moves air, way better than the original barrel cool. You could rig up a battery powered mattress pump for a third the cost and do better though, this is handy range bag size though.

I use a chamber chiller and it 100% cuts the barrel cool down time by at least half in my opinion.