I first saw the Bennie Cooley Sniper Assault Mount (BC-SAM) in action when I shot on the same squad as Bennie Cooley at the MGM Ironman. At first glance, the mount looks like many of the other AR style one-piece scope mounts. However, in function, it is unlike anything else available and is probably the most advanced and well-designed AR mount in the world.
Proper Eye Relief
Improvements in optics technology have led to better eye relief in scopes. Greater eye relief means that you have to mount your scope farther away from your face to obtain a proper and ergonomic sight picture. The BC-SAM
My favorite AR-15 3 gun stock is the Magpul PRS because it’s adjustable. I can have it fit me close to perfectly. The downsides are that it is heavy and I don’t like the sling attachment setup the way it comes from Magpul. Every once in a while during a 3 gun match its necessary to use a sling. I like QD (Quick Detach) sling mounts because they are fast, reliable, and are flush fitting. There is now a product that will allow conversion of the Magpul PRS sling system to QD. 
With 3 Gun season quickly approaching it is time to start practicing loading the shotgun. During a match, shotguns can be unloaded as fast as you can pull the trigger but loading them is a one shell at a time process. Practicing your loading technique can make a big difference in your overall time and score. Remington is now making Dummy Shotgun Shells that are to factory spec and have real shot in them so they feel the same as loading a live round.
Many shooters are curious about the advantages of using a heavy-walled billet receiver for their AR-15 build. Accuracy, in a word, is the biggest advantage. Heavy-walled billet receivers are more rigid or stiff. A more rigid receiver will prevent excess movement and flex when a round is fired. It will also help reduce harmonics that are damaging to accuracy. The series of events before, during, and after a round is fired are more likely to be consistent with a rigid upper.
