Only place I know that has them is CRAFM (or at least they have in the past)
They aren't cheap but in my opinion worth every penny.
Haven't had a single malfunction with mine, even without cleaning for a while, and is as accurate as it was day one.
I'm not easy on my equipment either. Barrel gets really hot at 3gun matches in the US.
Best group to date was 3 shots into a nickle sized group at 300m, about 2 months ago. Round count through the barrel at that time was north of 2500 rounds.
That was with factory 75gr Hornady Steel Match ammo.
With pretty much any ammo I've put through it, it is a MOA gun all day long.