Bore Sighter .45 ACP Cartridge Gold Plated Red Laser Boresighter 45acp Offers the brightest red laser allowed by Law. Non-handheld class 3R laser product, &lt;5Mw power output. Fits .45 ACP caliber rifles. Great for the range and ensuring your gun is still zeroed in after travel. Material: High Quality Brass. Battery: LR41 (included) Laser Wavelength: 632-650nm