SiteLite Ultra Mag SL-500 Green Laser Professional Boresighter

What makes the SiteLite Ultra Mag the best boresight money can buy?

Not all laser boresights are created equal.  Cartridge-style laser boresights are built to slide easily into and out of chambers with varying tolerances, and are never perfectly seated in the chamber.  You can see this in practice by just rotating a cartridge-style boresight in the chamber and observing the laser move on the target.  Even if you can get the boresight tight in the chamber, the laser is often off-center in the barrel, meaning it's off even more by the time the beam hits the target.  

Additionally, the batteries for the SiteLite SL-500 laser boresight don't have to fit in the chamber, so they can be larger and stronger, meaning they can power a stronger laser.  Not only is the SL-500 the best boresight money can buy, it's also the brightest.  The green laser is more visible in daylight than red laser boresights.  

The best thing about the SiteLite SL-500 laser boresighter?  It works in virtually every firearm, over 100 calibers, from .22 LR to .50 BMG (and shotguns, too).  You don't have to have a collection of boresights that only work with one caliber, nor do you have to manage the batteries for each and every one.  Just change the included o-rings, and the SiteLite SL-500 will work with your rifle, pistol, or shotgun.  

The SiteLite SL-500 laser boresighter may be the last boresight you ever have to buy.

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The SL-500 Laser Boresighter projects a laser beam onto a calibrated target for superior boresighting accuracy.  The SiteLite SL-500 laser boresighter is ideal for use with conventional and red dot scopes, as well as open sights.  The SL-500 laser boresighter fits most calibers, up to .50 caliber muzzleloaders, and 12 gauge and 20 gauge shotguns.  The SL-500 laser boresighter is a delicate, precision instrument that should be handled with care.  

The SL-500 is ideal for the professional hunter, shooter, or gunsmith. The SL-500 uses an ultra bright green laser which is 50 to 100 times brighter than red lasers, and is much easier to see in daylight. The SL-500 uses one DL 123 Lithium Battery (included) that provides a battery life of up to 10 hours (continuous use). The SL-500 uses the latest laser technology to provide superior boresighting accuracy. Super-strong magnets in the arbor securely centers the laser for consistent accuracy. A unique system of adapters and O-rings fit just about everything. To boresight, level the scope with the included Scope Reticle Leveler and Leveling Target. Then input your specific data into the included Ballistic Targeting System software program to create a custom laser boresighting target. Next, place the laser spot on the target, align your scope with the target crosshairs and you are boresighted for up to 300 yards.

Features

• Hardshell carrying case
• SRL-100 scope reticle leveler
• Laser boresighting target
• Rugged carrying case
• Ballistic Targeting System software
• Sight alignment verification target
• SiteLite Warranty

Specifications

• Battery: DL123 Lithium

Using the Sitelite SL-500

The following is an exceprt of of our full-length guide on how to boresight a rifle with the SiteLite SL-500 laser boresighter.  

When installing a scope on a rifle, it must be aligned with the rifle's bore to achieve precision accuracy.  Laser boresights have made this process very easy in recent years.  The SiteLite SL-500 laser boresight projects a laser beam onto a calibrated target for superior boresighting accuracy, which is a necessary step of properly sighting in a rifle scope. The SiteLite SL-500 is ideal for use with conventional and red dot scopes, as well as open sights.  The SL-500 fits most calibers of rifles, shotguns, and muzzleloaders.

Boresighting is not the end of the process of sighting in a rifle or pistol.  In fact, it is usually only the first step.  Laser boresights are meant to put your rifle or pistol "on paper," meaning close enough to be dialed in at range.  Once you have followed this guide, you will have to fine tune your scope alignment at a shooting range with live ammunition.  

How to Boresight Your Rifle or Pistol

You will need:

• The SiteLite SL-500 laser boresight
• A target.  Standard rifle zero or bullseye targets are acceptable.  The SL-500 includes a manufacturer-specific laser target.  
• A gun vice or "lead sled."  Your rifle needs to remain stable during the boresighting process.
• Somewhere with approximately 10 yards/25 feet of space between the rifle and target.

Place the target 25 feet from the muzzle.  The firearm must be secured and clamped into position. 

There are four pre-installed o-rings included with the SL-500 that should not be removed.  Two .22 caliber o-rings are present on the barrel insert of the boresight.  One .308 caliber o-ring is installed on the small muzzle adapter.  One 20 gauge o-ring is installed on the large barrel adapter.  

1. Install the proper o-ring and screw on the muzzle adapter, as required (see Muzzle Adapter Instructions above).  Lubricate the o-ring with Vaseline or silicone lubricant before inserting it into the barrel.  Do not use gun oil - some oils will swell and deteriorate the o-ring.

2. Insert the boresight all the way into the muzzle, with the arrow aligned with the top center of the barrel.  The lubricated o-ring should insert with a light drag.  Due to the varying tolerances in different bores and calibers, the o-ring can be put in any of the grooves for a better fit.  If the o-ring is too loose in the bore, then move the o-ring to the next largest groove.  This will enlarge the o-ring slightly for a tighter fit.  If it is too tight in the bore, move the o-ring to the next smallest groove.  Remember to always lubricate the o-ring with silicone grease or vaseline before inserting into the bore. 

3. Set the scope at its lowest power and switch on the boresight.  Adjust the position of the firearm to center the laser within the "Laser Target" located below the dotted line crosshair on the target.  The laser spot projected on the target will normally range in size from 1/2" to 3/4" in diameter. 

4. Ensure that the firearm does not move and that the laser remains centered in the target while making adjustments.  Adjust the scope crosshairs to align with the target.

5. Complete sighting in the firearm at the range, taking the first shots at no more than 50 yards to make your initial adjustments.

Remember, boresighting is only the first step in sighting in a rifle scope.  Put in plenty of range time to dial in your firearm to ensure that your first shot always lands where it's supposed to.  

Boresighting Tips

The target provided with the SiteLite SL-500 laser boresight is calibrated for a normal scope height of 1.5" above the bore of the barrel (center of bore to center of scope).  For substantially higher mounted scopes, you must mark a new elevation line above the horizontal dotted line on the target to compensate for the difference.  For example, if your scope is 2.5" high center-to-center, you would mark a line 1 inch above the dotted line and adjust your scope elevation to it.  This should not be necessary for most shooters with low/medium/high rings.  

Handguns with red dot scopes or lasers, to be sighted in at close ranges of 25 to 75 feet, can be boresighted by placing the boresighter laser dot on any object between 25 and 75 feet and aligning the red dot or laser with the boresighter laser dot.

Short barreled handguns are usually not compatible with laser boresighters.  Laser sights on short barreled handguns can be easily aimed by simply aiming the laser at a light surface about 25 feet away and adjusting the laser spot to align with the top of the front sight.  This method is very accurate for short barreled handguns and does not require a boresighter.  This method can also be used for red dot sights up to 75 feet.  

SiteLite unconditionally guarantees that their laser boresighters are more accurate than any other boresighter.  It is important to take your first shots at 50 yards because of many factors affecting boresighting accuracy such as parallax, bullet spin, variable ballistics, etc.  You should always sight in your firearm at a range after boresighting to compensate for these factors, regardless of any boresighter you use.