Sightmark 9mm Luger Boresight

Took it to the range after zeroing with the boresight, and my first group was dead center at 15 yards. Saves a ton of ammo and frustration compared to old-school methods.

Dropped it into my Glock and the red dot was bright and clear even in a well-lit room. Saved me a ton of time at the range getting the sights dialed in.

Chambered it like a regular round and the red dot appeared exactly where my sights were lined up — zero guesswork. Took about two minutes to get everything set for my pistol. Definitely the easiest way I've checked my zero before heading to the range.