The Striker is a shotgun with a short range and low flexibility, but with high power. It has a high loading capacity from level 1 to 12, but its loading speed is slow, so if you use it, you should strengthen it from the loading speed.
Prioritize the Riot Gun
If you don't care about weapons and want a strong shotgun, prioritize the Riot Gun. The Riot Gun can be obtained earlier than the Striker, and is an excellent and easy-to-handle shotgun, so it is recommended to use the money spent on the Striker to upgrade it.