OK, I did see that when Chen posted it, but I didn't realize it wasn't current production. Looks good!
I wonder if there were any technical challenges in making a smaller diameter piston and getting the gas volume and all that calculated correctly?
Any way, that new piston, combined with the new integral carrier key, is going to give all competing systems a hell of a ride!
When it's all said and done, I really, really like the idea of being able to remove and maintain the thing without disassembling handguards. Frank, keep up the good work! And thank you for your continuous product improvement!