Boresighting the old-fashioned way — by looking down the bore of a rifle at a target — is not difficult. With a conventional bolt-action rifle, visual bore-sighting can be done quickly and easily: rest your gun securely on bags, remove your bolt and set up a 50-yard target with a large bright orange or black center circle. Look through the back of the action and you should be able to sight down the bore with your own eyes just fine. There’s no need for expensive hardware. In fact it may be easier to bore-sight the “old-fashioned way” rather than try to see a laser in bright sunlight at 50 yards (or even 25).
However, with lever guns and semi-auto rifles, including the popular AR15, M1 Garand, and M1A service rifles, the design of the receiver may make it virtually impossible to sight down the bore with the naked eye. That’s where a modern laser bore-sighting device comes in handy. For those situations where a bore-sighting tool is actually needed, we recommend a laser bore-sighter that fits inside your chamber. The in-chamber configuration is more fool-proof, and is inherently safer.
In-Chamber Laser Should Be Safer
Among the laser bore-sighters available on the market, we strongly favor those that fit in the chamber, rather than in the bore. With muzzle-entry laser bore-sighters, you could have a nasty accident if you forget to remove the device. There is always the chance you could chamber and fire a round with the muzzle-entry bore-sighter still in place. Instant Kaboom. That has happened more than once. With an in-chamber bore-sighter, there is no possibility you could chamber a loaded round with the bore-sighter in place. That’s an important safety advantage. Sightmark in-chamber bore-sights are shown in the video below. You can see that, with the bore-sighter in place, you cannot chamber a live round.
In-Chamber Bore-Sighters for Rifles Sightmark offers compact laser bore-sighters that fit inside your firearm’s chamber. The laser is housed in a brass assembly machined to duplicate a cartridge. These are easy to use — simply twist the end-cap to activate the laser, then place the bore-sighter in the rifle’s chamber. The affordable ($29.99 – $35.77) Sightmark boresighters are offered in a wide variety of pistol, shotgun, and rifle “chamberings”. Rifle options include: 17 HMR, .223 Rem, 22-250 30/30, .308 Win Family, .25-06/.270/.30-06, 6.5×55, .270/.300 WSM, .300 Win Mag, 50 BMG, and many other large hunting calibers. SEE Full Product Line.
Cabela’s also offers a Professional .223 Laser Chamber Boresighter that fits in a .223 Rem rifle chamber. This $59.99 unit, shown below, can be adapted to other chamberings by adding a caliber-specific sleeve over the .223 core unit.
Adapt Basic Unit to other Calibers with Sleeves
Cabela’s Professional .223 Laser Chamber Boresighter unit can be used for a variety of chamberings by fitting additional $19.99 caliber-specific sleeves (sold separately). Each sleeve is precision-machined from brass to SAAMI specs. One purchaser notes: “Extremely well made, the fit is so precise that I would recommend using a drop or two of light oil on the 223 laser insert before fitting it into the sleeve.” Available chamber sleeve calibers include:
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With larger-caliber rifles, manual bore-sighting (with your eyeballs) is not that difficult. Just remove the bolt, and look through the bore at the target. It helps to have a well-illuminated, high-contrast circle target about 8″ to 12″ in diameter. When you’ve got the target centered, then stabilize your gun on the rest so it doesn’t move from that position. Because bore-sighting the old-fashioned way is not that difficult with larger calibers, we’re not sure laser bore-sighters and other gadgets are really needed.
However, with smaller calibers (.17, .204, .223), manual bore-sighting is not so easy. Much less light makes its way down the smaller-diameter bore, and it’s more difficult to find the target on the background. That’s why we welcome two new products from Sightmark. This Texas-based company has developed in-chamber laser boresights for 17 HMR and .22LR rimfire guns. The tiny boresights are correctly dimensioned so they fit in rimfire chambers just like normal 17 HMR or .22LR cartridges. With the boresight in place, simply flick a switch on the battery pack and the laser dot shows exactly where the rifle is aimed. The dot is roughly 2″ in diameter at 100 yards.
Sightmark rimfire boresights are made from brass, so they are gentle on your chambers. The separate battery pack holds two (2) AAA batteries, which will power the laser for about 30 hours. We like the fact that the battery pack is separate. That makes it easier to swap in new batteries, AND, importantly, the battery pack makes it obvious when the boresight is in use. That lessens the chance that someone could mistakenly try to chamber a live round with the boresight in place.
Sightmark Rimfire Boresights Developed After Extensive Comparison Testing
“We tested every competitor’s chamber boresight for the 17 HMR and .22LR currently on the market and found that they did not work well, so we decided to create one that would,” said James Sellers, president of Sightmark. “Our Sightmark 17 HMR and .22LR boresights are as accurate as our other award-winning chamber boresights, so there’s no guessing if you’re on target”. Sightmark 17 HMR and .22LR Rimfire boresights retail for $47.99 and can be ordered directly from the Sightmark Online Catalog.
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Cabelas.com and LaserLyte have teamed up to produce compact laser bore-sighters that fit inside your firearm’s chamber. The laser is housed in a brass assembly machined to duplicate an actual cartridge. To activate the laser, simply place the bore-sighter in the rifle’s chamber and close the bolt. There are two core units, the Laserlyte Cabela’s Premium .223 (collimated lens $99.00) and the Pro .223 (standard lens $69.99). Both the Premium and Pro bore-sighters fit a .223 Rem, but they can be adapted to other chamberings by adding a caliber-specific sleeve over the .223 core unit. In addition, LaserLyte makes separate in-chamber bore-sighters for the 17HMR and 50 BMG.
Adapt Basic Unit to other Calibers with SAAMI Sleeves
Both the Premium and the Professional .223 Boresighters can be used for a variety of chamberings by fitting additional caliber-specific sleeves (sold separately). Each sleeve is precision-machined from brass to SAAMI specs. Available chamber sleeve calibers include:
Bore-Sighting the Old-Fashion Way
We are not big fans of laser bore-sighters, as we think they are unnecessary for most situations — at least with conventional bolt-action rifles. Visual bore-sighting is not difficult. Set up your gun securely on bags, remove your bolt and set up a 50-yard target with a large bright orange or black center circle. Look through the back of the action and you should be able to sight down the bore with your own eyes just fine. In fact it may be easier to bore-sight the “old-fashioned way” rather that try to see a laser in bright sunlight at 50 or 100 yards.
When a Laser Bore-Sighter is Valuable
There are instances when having a laser bore-sighter can save time, such as when setting up a chronograph. Also, with many semiautos and lever guns, it is difficult to sight down the bore because of the action design. Without using mirrors, it’s hard to visually bore-sight an M1 Garand, for example. Likewise, it can be difficult to bore-sight an AR15, because the stock and buffer is in line with the bore. For these rifle types, a laser bore-sighter is a valuable tool.
In-Chamber Laser Should Be Safer
We like the new LaserLyte design because it fits in the chamber, rather than in the bore. In-Chamber laser bore-sighters are also made by Aimshot, Firefield, and SightMark, in a variety of sizes. With muzzle-entry laser bore-sighters, you could have a nasty accident if you forget to remove the device. There is always the chance you could chamber and fire a round with the muzzle-entry bore-sighter still in place. Instant Kaboom. That has happened more than once. The new LaserLyte/Cabela’s bore-sighter fills your chamber, so there is no possibility you could chamber a loaded round with the bore-sighter in place. That’s an important safety advantage. The LaserLyte K-50 in-chamber bore-sighter is shown in the video below.
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However, with smaller calibers (.17, .204, .223), manual bore-sighting is not so easy. Much less light makes its way down the smaller-diameter bore, and it’s more difficult to find the target on the background. That’s why we welcome two new products from 
