Laser Bore Sights provides the most convenient and accurate method for sighting in rifles of all types. One can purchase one from Amazon, eBay for better choice.
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The difference is that red-dot sights have contained aiming reticles, whereas laser sights use an emitted laser beam that must fall onto a target. Red-dot sights are used mainly for more accurate ADS (aiming down sight) firing and laser sights allow for less-accurate, but made more so, shoulder-firing.
Once you activate the laser sight, basically where the laser is pointed is where the bullet is going to go.
To sight in a rifle without shooting, you can use a bore sighting tool or a laser boresighter. These tools help align the rifle's sights with the barrel, ensuring accuracy when you do eventually shoot.
There are laser sights for almost any handun. Try Crimson Trace.
Yes, they sure do chimichanga.
Bore sights can be purchased from outfitters such as Cabela's, Gander Mountain and Dick's Sporting goods, or online from store such as Midway USA or Amazon.
There are 2 ways to easily sight-in a rifle. With a laser bore sighter or by shooting. First you'll want to clean your rifle and tighten any loose screws for your sights (Remember, a dirty gun is an inaccurate gun). If you choose to use a laser, just simply adjust the sights and double check. To sight-in a rifle by shooting, you'll want to rest your rifle on a table to ensure your gun has as little movement as possible while you're shooting and adjusting. It also helps to have very little wind. Just aim for a bullseye, take a few shots (3 or more in case of any wind or bad ammunition) and adjust your sights until they're accurate. Repeat a few times to ensure accuracy. If your own a bore laser, I suggest using both of these methods. First sight-in using the laser, then check by firing. Sighting-in an MoA scope is significantly more difficult.
A laser bore sighter is primarily used to check if the barrel of a rifle or other gun is straight. They are used in the production of most firearms and by gun owners who are upgrading their weapons.
There are several. You can attach laser sights, silencers, flashlights.
For handguns? Yes. Just don't point it at any airplane.
None that I know of, the standard 2240 has no way of mounting a laser without some sort of modification.