Badger Ordnance 306-75
These are the rings that the USMC selected to mount the 34mm Schmidt & Bender 3-12x50mm PMII LP scopes on the M40A3 rifles. They have six screws on the front ring and four on the rear ring, and are 1" high.
Each ring is stamped "USMC" below the serial number.
This item is not available for export outside the US.