Locked arms are common in shooting. They are also detrimental to accuracy. Locked joints restrict blood flow and cause muscular movement. It is an unusual shooter that locks the arms and doesn’t over-grip the handgun. Test it this way: Hold a sewing needle or pin at eye level, like a pistol sight. Focus on the pin and try to reduce its movement. Try with a locked arm and then with a naturally straight arm. We don’t need muscle beyond what is required to hold a 40 ounce handgun in place in-between shots. Relax, you’ll also last longer on the range.