Thanks guys. Being a noob to the Carbine Club, I only have issues back to #357. I'm not particular about this band right now, as it's for a shooter I'll be putting together if I ever find another barreled receiver. I only bought one from the last CMPicon batch. I knew I should have bought more. I was just curious as to whether it was a USGI part, and possibly learning when approx. it was introduced.