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.