Chris Costa of Magpul Dynamics fame is best known for his aggressive stance with firearms. No, not politically speaking, I mean his actual stance. He’s a supporter of an aggressive forward grip on the firearm that wraps most of the way around the barrel, commonly referred to as the “Costa Grip.” He says (and I agree) that this gives the shooter more control over the weapon, even when that weapon is a fully-automatic M60 machine gun. What I like the most is when the gun runs dry, he instinctively starts running the immediate action manual of arms for his M4 — turning the whole gun and looking into the ejection port for a jam, as if preparing to clear it and get the gun running. Muscle memory.