I think the boltshot is op as all hell. The major things that need to be changed about it are
1. Either take away the OHK capability OR take it out of the loadout option.
2. Using a charged shot empties the clip instead of just using half.
3. Instead of having the charge shot being timed, make it use more of your ammo like the PP. The longer you charge it the more ammo is used or the less effective it becomes.