Yep, I believe you're right, sorry. It's the HK 22s that come from Umarex, as well as the Colts and some Walthers. (I had one of those Colt and one Walther POS).
SIG is the one that's gotten into bed with GSG, another big user of zinc. (I've owned two of those POS, a GSG-5 and a GSG Kalashnikov)
Don't own any of them any longer.
Y'all aren't allowed to carry loaded rifles in your vehicle?