How come Mokarin's mom is so good with guns? In multiple episodes of Sabagebu!, Mokarin's mom handles her gun exceptionally well and she's sort of badass too (Episode 7).



But how come? Was she part of her own Survival Club? Or, has she had some professional experience with guns? Was this ever revealed in the anime or manga?

Note: spoiler is acceptable.
Momoka's skill is possibly hereditary. Kazue Sonokawa (her mother) possibly has a natural affinity with weapons just as Momoka does. She's possibly seen a bit of action when she was younger too and has the lessons of experience as an advantage.

Another contributing factor is that Kazue is an adult. Adults in Japan are allowed weild more powerful weapons than juveniles' airsoft guns. Adolescents can only use guns which are limited to a kinetic energy of 0.135 Joules. However, adults can use guns with 1 Joule - which could be why her bullets seemingly shot through the floor and also gave her an advantage over Momoka

Reference.

(It was probably just the mangaka's decision though)