He's still on Gunbroker, and I just got a bunch of Beryl translucent green 5.56 mags from him for my SLR-106's.
They function excellently, so far anyway, and are considerably easier/faster to insert than the slightly over-tight Bulgarian Circle 10 mags I've got.
genuine-militaria_eu - Marcin Piorko, is an excellent+++ seller and with the Circle 10 mags now drying up, and even more expensive than they were, I'd go for these Beryl mags, "in a heartbeat".