This is Gun Animations with Staff.
I recommend using this by mod that drop staff type guns. also the screen shot are Magic and Staff of Gun addition.

///Introduction
+ About Dynamic Animation Replacer.
when equipped the staff on left hand, enabled the each motions.
so Dynamic Animation Replacer are required.
it's possible to replace the motions to put those file directly without this, but player and all npc's motions will be replaced.

+ About Motions
when fire(releasing motion) from right or left hand, if fire from other hand, this motion will slide.
as reason, probably, the right hand fire motion prioritized with skyrim's specification.
also all motions of right hand adjusted to showing gun's correctly position.

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As loose files, this is using the vanilla motion for conditions setting, if want to change other, replace from those.
mag_runbackward
mag_runbackwardleft
mag_runbackwardright
mag_runforward
mag_runforwardleft
mag_runforwardright
mag_runleft
mag_runright
mag_runstrafeleft
mag_runstraferight
mag_turnleft60
mag_turnleft180
mag_turnright60
mag_turnright180
mag_walkbackward
mag_walkbackwardleft
mag_walkbackwardright
mag_walkforward
mag_walkforwardleft
mag_walkforwardright
mag_walkleft
mag_walkright
staffmagic_runarm
staffmagic_walkarm
staffright_equip
stf_equip
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///Installation
put those in your dynamic animation replacer's folder.

///Uninstall
remove those from your folder.

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Update 1.1
adjusted the left and right hand of concentration(full auto) type

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Update 1.2
change the release motions to dynamic more than last version.

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Update 1.3
adjusted right release motion and one hand motion's
add weapon condition for using shield.
the shield type are only spell breaker so when quipped this, enable gun motions.

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Update 1.4
adjusted right hand's releasing motion.

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Update 1.5
add the motion like reload.
when change right staff to other type's staff, the motion will be start.
also this motion are using Magic and Staff of Gun addition and the motion will be start after use this toggle magic that is included in this mod.
mrh_and_mlh_forceequip.hkx

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Update 1.6
add new motion and adjusted right hand's releasing motion.

+ new motions
those are like throw grenade and other.
the screen shot magic are including to Magic and Staff of Gun addition.

===grenade motions===
when equipped the fire and forget(single fire) of distraction type magic to right hand, the motion run like grenade throw motions.

===throw weapon motions===
when equipped the concentration(full auto) of distraction type magic to right hand, the motion run like throw.