You are going to make me go looking for the JP whatever holo type sight aren't you? It looks like a backwards installed peep. It's in one of my mags on a Glock 40. Small enough to actually work for a carry/duty gun. Don't know how well it would handle recoil....

But.....ain't many troubles that a man caint fix
with seven hundred dollars and his thirty ought six."

Lindy Cooper Wisdom