When your off-hand is injured, you can still shoot a long gun accurately from the shoulder-mounted position.
At the range, when officers are required to quickly identify and engage targets depicting a bad guy pointing a gun at them, it’s common for the officer to actually shoot either the bad guy’s gun or the hand or arm holding the gun. This can be attributed to a couple factors. First, the bad guy’s gun is probably oriented in front of his face, with his arms and hands covering the “center of mass” zone that officers are trained to target. Another reason the officer is so focused on the bad guy’s gun is because the gun epitomizes the threat the bad guy poses to the officer. Therefore, rounds tend to impact near the officer’s focal point: the gun. Unfortunately, the same logic rings true when the bad guy sees the officer’s gun pointed at them.
Since being shot in the hand or arm is a definite possibility, officers need to be proficient in shooting one-handed. This isn’t a big deal with a handgun, but shooting, and even more importantly, weapon handling, can be a little tricky with a long gun such as an AR-15 or shotgun. Of course, there may be times when transitioning to a handgun is the best option. However, with practice, you can certainly keep your long gun up and running one-handed. This would afford you the advantage of superior firepower, extended range, and in the case of the AR-15, a much higher magazine capacity. For simplicity, let’s consider the officer is a right-handed shooter whose left hand or arm has been rendered non-functional.
There’s no denying the fact that long guns are meant to be fired two-handed. However, if you have proper two-handed shooting technique, shooting with only your dominant hand isn’t much different except that you aren’t able to use your off-hand to support the front of the weapon. This is where it is critical to keep your elbow positioned vertically, under the weapon. If your elbow is oriented horizontally, you’ll find it extremely difficult to keep the muzzle from dipping. At distance, bracing the barrel on an object will add stability and improve accuracy. With a little practice, you’ll find that shooting one-handed is not as difficult as it sounds. In fact, shooting is the easy part.
If you get fatigued or when you’re adversary closes distance, maintaining a shoulder mount can be more trouble than it’s worth. In such case, transitioning to a sidearm is a viable option. However, if you don’t have a sidearm or if you prefer to stick with your long gun, you can employ a “close-quarter hold” with the stock tucked under your arm. This position affords you considerably more leverage than the shoulder mount, especially when you only have one hand on the weapon.
One-Handed Pump Shotgun
Operating an AR-15 one-handed is much easier than a pump-action shotgun for several reasons, not the least of which is that the AR-15 is a semi-automatic firearm while the pump action shotgun requires manual operation. Imagine driving with only your dominant hand. Would you prefer an automatic transmission or a stick shift? The AR-15 will also be much lighter in most cases and hold many more rounds. This means less one-handed reloading, which is hugely beneficial.
Recoil management is another significant issue when you’re shooting a long gun one-handed. Without question, the AR-15 chambered in .223 is going to have much less recoil than a 12-gauge shotgun, making the AR significantly easier to control.
Working the action on a pump gun one-handed is quite challenging and probably won’t happen very quickly. Ideally, you could find a rigid object with an approximate 90-degree angle—the corner of a wall, a desk, the tailgate of a pickup, etc.—to press the forend against. This will allow you to force the action rearward (open) in order to eject the expended shell. Then hooking the rearmost portion of the forend against that same object would allow you to close the action, chambering the next round. If the environment you’re in doesn’t provide anything on which to hook the forend, you can work the action one-handed. This is even more difficult than using an object to work the action, but with sufficient practice, it could be an option.
Obviously, practice this with an empty gun.
One way to work the action of a pump shotgun one-handed is to first tuck the stock under your arm, clamping it between your inner arm and torso. Once the shotgun is secured in this manner, slide your palm under the triggerguard and grab hold of the bottom of the receiver. Pull the shotgun further toward you and clamp your arm higher on the stock. From there, you should have sufficient leverage to open then close the action. Unfortunately, you will need to repeat this process after every shot.