I put the TruGlo on my M&P 15-.22. It was a real breakthrough for my 8-year-old grandson who was having trouble with the iron sights (he can't close his left eye-lid). All of a sudden he is shooting with both eyes open and putting the rounds in the middle of the target. The smiles are priceless!
I then tried it out on my AR-15...and I was smiling too! I've ordered a second one. I will say that the .223 did cause the screws to loosen up as I shot, but I tightened them up several times as things warmed up and they seemed to snug down pretty well.
Yesterday I went to shoot, and discovered the battery doesn't last a week when you forget to turn it off. That's no surprise, batteries are cheap, and I'll remember to turn it off from now on.
The only problem I haven't resolved is that the dot can disappear on a light covered target in bright light.
Also, I can set up the iron sights on the .22 so they co-witness with the red dot. Although the rear sights were considered an obstruction by my grandson - they didn't bother me. On the AR, my rear sight is mounted on the handle, which I had to remove to mount the red dot. Is the best solution to buy a new rear sight?