Simple and effective - Sightmark Laser Bore Sights

If you've never used a cartridge bore and have only tried the universal "end of the barrel" variety this is in my opinion a vastly better option. While buying a bore sight for each caliber seems a more expensive way of sighting in your firearms I have found that time and accuracy if initial calibration is way improved over the universal bore sights and honestly I can lend the bore sight out to my friend while at the range to speed up there calibrations too so we can get to shooting and not wasting ammo.