I have a thompson contender barrel from SSK in that caliber and it works very well. My Order will be in ASAP for an upper for my AR lower.......:o)
Stay Safe LC !
Actually, it was the SF operators who, on their own time, began developing the 6.8mm SPC round. Some on the team even spent their own money on the project. I'm sure they talked to some reloaders and hunters, though. They only approached Remington and Winchester when they were already quite far along the way.
"Stay Safe LC !"
I sure will! I'm finally back from deployment, and our whole squadron made it back safe and sound, no casualties OR dead airplanes. That's after six months in five different sites all over the globe, in addition to ENDURING FREEDOM.
Is your AR upper going to be in .270 JDJ, or 6,8? How much barrel/ configuration? And what weight bullet and rifling twist are you looking at? Inquiring minds are downright fascinated; I've got a similar 276/140 grain wildcat project of my own going on....