1. Uses Cocker threaded barrel (not included) instead of twist-lock barrel.
2. Angel threaded for feednecks. Also same as Empire or Ion threads PLEASE NOTE: A feedneck is no longer included with the stock ULE body. You will need to add your own feedneck or you may purchase one listed. 3. Ball detent (Angel thread) 4. Fits RT Pro, RT ULE Custom, Emag, Minimag, Black Bodies are $135. Colors when available are $10 more. Feed Cups were designed for Halo style press fit loaders and have no locking feature and are now an option. ULE stands for "Ultra Light Engineering" because these babies are light as a feather! 3.9 oz total weight with a basic feed neck and detent. Note: If you want to put this on an Automag/Classic or Minimag, you will need to press the twist lock assembly out of the rail. Also, this ULE body will not fit the Classic Automag RT.
Please Note: These pictures of colored bodies will vary with monitor type/monitor settings and particular browser and do not necessarily represent the actual color of the product.