I use a Leupold Deltapoint Pro on my 22. The emitter is sealed behind a tiny window. It is fully submersible/waterproof. Sure you can get water drips on it. Just one twitch/shake and it's clear to shoot. No issue with water or rain. Much larger window and WAY better optical quality than a Romeo/Holosun T1 clone. Only issue is durability if dropped... but this is a 22 not an AR15 for SHTF. If your eyes are good enough and gun accurate enough it is capable of amazing accuracy. From the bench with 1x magnification, my buddy put 4 out of 5 shots in the same oval hole inside a 1" target at 50 yards. The 5th opened the group up to an inch in size overall. More commonly, I can only shoot about 2-2.5" groups due to lack of magnification at 50 yards and my old eyes. I usually can put 4/5 inside a 2" target at 50 yds with CCI Standard.