In the past I have bought romy g original barrel kits use the barrel for my Russian and then sell the kit. Can't help you with a builder I build my own if you were close I could I have all the tools.Amazing. I'm struggling with barrels and builders. We're gonna talk lol
Romy g barrels make for a super easy build I do is press all the components on because they're already cut and they line up and press the barrel in and just either ream it if it's really close or go one oversize pin they have a lot of nice markings on them and if you really lucky you get a y stamped barrel which is RussianThat's a good idea. Heard those G barrels are really nice