As some of you may, or may not, know, the TOS type-1 phaser had its firing trigger on the bottom. This button is present on the original working prop, the Art Asylum toy, the Master Replicas replica, and even the recent Wand Company Remote, all have it on the bottom of the phaser.
However, a lot of publications, online references, and guides have the targeting sight as the t-1's trigger.
So how can the merchandise get it so right and the "experts" get it so wrong?

However, a lot of publications, online references, and guides have the targeting sight as the t-1's trigger.

So how can the merchandise get it so right and the "experts" get it so wrong?