Sylvestre is waiting on barrels to build complete rifles from build kits. They will be $2500 when available. Pricey, but with the charging slot dust cover down and the bolt forward they are as well sealed as a BRN-180, and there's no piston to break. I forgot to ask what kind of barrel they will use, but even with a heavier barrel it will likely be less front heavy then a piston 180.