The gun ships with a tiny peep hole in the rear sight. It's a slip fit on a 3/32 " drill bit. When the Jackboys approach, you need fast sight acquisition, not a bench rest peep sight.

I opened it up very carefully with a 7/64 bit, then a 1/8. That's where I stopped. It's much more useable now, about like the large aperture on AR sights.

I used a small cordless drill at low speed. Worked fine.