.40 S&W Laser Boresighter Easily Sight in Scopes Pistol Carbine USA Seller by SpentShells Perfect for hunters, competitive / recreational shooters and law enforcement. Class IIIa Laser Wavelength (nm) 632 - 650, Power (mW) &lt; 5 Improves accuracy. Easy to use. Get on target fast and easy with Spentshells Boresighter