Swep not always playing view model primary attack animation

[Acecool]

I'm having issues with my SWEP base. It's not always playing the VM Primary Attack. Third person works perfectly. Bullets shoot perfectly.

[lua] self:ShootBullet( 15, 1, 0.03 )
self.Weapon:SendWeaponAnim( ACT_VM_PRIMARYATTACK )
-- self.Weapon:SendWeaponAnim( self.Animations.vmprimaryattack )
self.Owner:SetAnimation( self.Animations.primaryattack ) -- 3rd Person Animation [/lua]

I'm not calling SendWeaponAnim anywhere else. Is there a reason that the VM wouldn't display the animation 100% of the time, while the third person/world model is displaying it exactly as desired?