Sightmark .223, 5.56x45 NATO Boresight

Got my optic sighted in within five minutes using this. The chamber fit is precise and the NTOA recommendation gives me confidence in its accuracy.

Wasted maybe ten rounds getting my rifle zeroed last time, so this thing paid for itself on the first range trip. The fact that it chambers exactly like a real round and was tested by a tactical group gave me confidence it was actually aligned properly. Saved me a box of ammo and a ton of frustratio

Chambering it feels just like loading a real round, which made the whole setup process quick and intuitive. I wasted way fewer shells getting my rifle zeroed after using this, and the NTOA recommendation gave me confidence it was worth the money.