Replacement .40 O-Rings for SiteLite Laser Boresighters SL-ORING-40

Under normal use, your SiteLite o-rings should last a long time.  But if you're not a normal user, your o-rings may need replacement.  

This is the .40 size o-ring that ships in the factory o-ring kit of the SiteLite SL-100, SL-150, and SL-500 laser boresighters. 

Package contains ten o-rings.  

When using SiteLite boresighters, o-rings should always be lubricated using silicone grease or Vaseline.  Never use gun oil to lubricate o-rings, the oil will break down the ring and cause premature failure.