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I have a single point sling I don't use during prone shooting at all, and I was shooting from prone with my right arm (I shoot left handed) stabilizing the front of the gun. Also, I've had NPOA explained to me, but how it was explained was very vague, can someone maybe help me understand it a little better?
The NPOA concept is this:
1. You must get into a stable "bone-supported" position, instead of holding the sights on the target with muscle power. The idea is simply this: Muscles have arteries running through them and feeding them, and each time your heart beats your muscles will jump a little. If you "muscle" the sights on target, you will never achieve your most steady hold, because your sights will "bounce" with each heartbeat. Also, muscles fatigue, especially when asked to hold a heavy object very still, and when you "muscle" your sights on target, you POI will drift a little as your muscles become tired. Finally, it is simply human nature, at the point that the trigger breaks, to slightly relax your hold, thereby throwing your POI off (you do this subconsciously). In a bone-supported position you try to achieve a position where the rifle is supported entirely by bone against bone against bone against the ground ("The leg bone connected to the thigh bone, the thigh bone connected to the.......you get the picture.) No muscles involved.
2. There are several ways to verify a good bone-supported position. One way is, after you get into position and have your sights on target, close your eyes, relax, take two breaths, then open your eyes. If your position is good, your sights will be on target when you open your eyes. If they are not, you shift your entire body to bring the sights on target. Verify again, move again, over and over, until you have it pegged. After doing this for a while, with practice, you can usually drop into position and be either on target or pretty close.
3. The advantage of NPOA is, after each shot, when you "fall" back into position after recoil, you will find your sights to right back on target. (I used to love shooting from the sitting position with my M1 Garand. With each shot, as my whole body rocked back under recoil, when I rocked back into position my sights would drop right back on to the target.)
4. The single-point sling you are using is useless as a shooting aid in any long-range situation. It's a CQB sling, and may have its uses if you are clearing rooms, manning a roadblock where you are checking peoples ID's and credentials, etc. It has no place in long distance shooting. You must use some sort of sling that can be formed into a loop sling - a G.I. web sling, which can be found for less than $10.00, is pretty good, and a 1907 leather (or Biothane, now) sling is best. Get one. Learn to use it. CQB equipment and shooting at 100 yards plus are simply incompatible concepts - like driving tacks with a sledgehammer. With a good solid bone-supported position, NPOA, and a decent sling properly used, you can shoot from prone and sitting just about as well as you can shoot from a bench with a sandbag rest.
Here's a true story about NPOA:
A Marine Corps Team member was shooting in the National Championships at Camp Perry back in the '80's. He was shooting an M14, and at that time there were no regulations regarding mandatory use of eye protection - and he wasn't using any. If I recall correctly, he was shooting the 300 yard rapid-fire prone stage, where you fire two shots from one magazine, reload with a fresh magazine, and fire eight more shots. He had fired the first two rounds, did his reload, and on his third shot from the new magazine had the ejected cartridge bounce back and hit him right on the right eyeball! Both of his eyes slammed tightly shut and started watering profusely, so he was effectively blinded. But because he had a good NPOA he stayed on the line, and fired his remaining 5 shots. When his target was scored, he had all 10's except for one shot that he dropped into the 9-ring. (He didn't win the championship though.)
If you get a chance, attend an Appleseed shoot. NPOA and sling usage will be explained, demonstrated, and practiced in much more detail than I can explain here. BTW, one of the exercises you will do at an Appleseed shoot is to get into a good prone position with NPOA, close your eyes, and shoot a 10-shot string on target with your eyes closed.
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