Thanks guys. This ones not for sale. I bought the parts set some 6 years ago and just now got around to putting it together. I sourced a Browning Gold 10 bolt link that makes the HK FCG a practical fit. And it uses FAL dual recoil springs to power the carrier. Runs pretty slick with only 75 rounds of wolf 7.63x39 as tested so far.
Heres the Browning link in front of a custom turned recoil plunger.
The barrel is .308 groove diam. SS finned as some day I want to make up match ammo and see what the tuned trigger can print. Dang house work keeps getting in the way of this more fun stuff. I got a portable saw mill in a box in my shop with 43 pine saw logs stacked up waiting for me to make lumber for a couple buildings I need.