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The laser adjusters are the two setscrews located in the brass bushings in the laser housing. The laser is adjusted using the .050" hex key (Allen wrench) we supply with the TLR-2. The wrench fits only the two adjustment setscrews. If the TLR-2 is mounted below the weapon (as is usually done with a handgun) the bottom screw controls elevation and the side screw controls windage. Turning a screw clockwise (facing the bushing) moves the screw into the housing. The point of impact will move in the same direction that the screw is moving. (The laser will move across the target in the opposite direction.) At 50 feet, one full turn of the screw will move the point of impact about 18 inches. When making very large adjustments, if one adjuster appears to run out of movement, it may be necessary to back off the other adjuster slightly to free the laser cartridge. An easy method of zeroing is to take a sight picture with the iron sights and adjust the laser dot to top center of the front sight. Doing this at about 50 feet optimizes the trajectory out to about 25 yards with a handgun. Then fire a group and make any necessary corrections. (Support the gun, taking the original sight picture, and then move the laser until the dot is at the group center.) There might be some initial drift with a new TLR-2 as the parts settle in under recoil. Since it's a good idea to fire at least 50 rounds after making any changes to a pistol which might affect function (and hanging a weight - the TLR - onto the muzzle end certainly qualifies), this break-in period should not be considered a problem.
THEORY: There is only one distance where the bullet path will coincide with the laser. On a normal weapon, the sights are mounted above the bore line and are adjusted to look slightly down with relation to the bore line. When the weapon is fired, the bullet “climbs” (actually, a bullet DROPS from the bore line from the moment it first leaves the barrel, but the bore is tilted upward slightly so the bullet is physically traveling upward for a short distance), crosses the sight line, reaches its upward peak (the peak of the “mid-range trajectory”), descends to cross the sight line a SECOND time, and after that it’s all downhill. How the sights are adjusted, along with the muzzle velocity of the bullet (a 10mm is faster than a .45, and a rifle faster yet), determine where these points occur. The user must decide how high above or below the sight line the bullet can be allowed to strike and adjust the sights accordingly. A laser is seldom mounted above the bore line. It is usually below or to the side. This means the bullet crosses the laser sight line ONLY ONCE. This point is the “zero range.” For a laser mounted below the bore, at distances less than the zero range the bullet will be above the sight line. Beyond the sight line it will be below. Because the bullet crosses the sight line only once, it will deviate from the sight line FASTER WITH A LASER than with conventional sights. If mounted to the side, the bullet will also deviate to the side of the laser line as well as up and down. In practice, a TLR-2 on a handgun can be adjusted to keep the bullet strike within about 2” high and 2” low out to about 25 yards, which is better than most people, and a lot of guns, can shoot.
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