How much sight adjustment is needed to move POI? The impact radius is the distance between your bullet's impact and your point of aim. An easy way to remember this is: Move the rear sight in the direction you want the impact of the round to go. Conversely, adding material to the rear sight or removing it from the front sight moves the point of impact upward. If you want to move the rear sight to the left, you need to fasten the slide in … Sight adjustments that move shot groups left or right. Elevation. Experimentation is necessary when adjusting the sights because unlike a scope, there is no calibration to tell you how much you need to raise or lower the sights to move the point of impact a given distance. Sight adjustments that move shot groups up or down. DTT. Every .010” of rear sight movement will move the impact approximately 1”. The right way to move a rear sight is with a sight pusher; if you don't have one, a 'smith/armorer should. You are going to fasten the slide into the vise with the top of the slide even with or just above the top edge of the vise jaws. No, you move the rear sight in the direction you want to move the POI. Point of impact adjustment is measured in inches from the center of the group shot to the point of impact desired. The windage and elevation settings on a rifle sight that allow it to hit the center of the target when aimed and fired correctly. Do this same process again for the rear sight. 3. 2. Point Of Impact . Move the rear sight in the diretion you want to move the POA. Sight radius is calculated from the rearward most portion of the rear sight to the rearward most portion of the top of the front sight in inches. 2. Once the sight is loosened, the shooter slides it along an incline and then re-tightens the sight in the new position. Note 1: rear sight to front sight (shooter side of each) distance for open sights and center to center distance of scope rings Note 2: For group impact center below the point of aim, raise the rear open site or shim the rear scope ring. The distance to target is 720 inches ( 20 yards ) and the sight radius is 6.25" ( typical milspec 1911 with fixed sights ) With these parameters it shows a needed correction of .013" So if it was shooting 1.5" high at 20 yards we would either have to lower the rear sight or raise the front sight by .013" I hope you found this helpful. Sight Radius. The effect on point of impact will be opposite, depending on which sight is altered. That depends on your sight-in distance and the sight radius (distance between front and rear sights). 4 MEASURE YOUR IMPACT DISTANCE. 1911Tuner Moderator Emeritus. burrhead, Feb 1, 2004 #2. You will need a SHORTER sight. The impact change from the movement of the rear sight is about the same amount as the height impact change with the front sight. PIA. Decide which way you want to move the rear sight. 4. That would be 900 inches. In other words, move it to the left in your situation. personally i would shoot a 3 shot group at 50yrds, then move the front sight post 1 click and shoot another 3 shot group. Rifle Zero. Windage. To calculate, convert "distance to target" into inches then divide the sight radius by distance. To move point of impact downward, one should either add material to the front sight or remove material from the rear sight. that when fired with a correct sight picture, shot groups are centered. Example: let's say you wanted to sight in your pistol at 25 yards. The sight radius is the distance between the BACK of the Rear Sight to the BACK of the Front Sight. 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