In the recent change log the nagant can stay zoomed in whilst the gun is being cycled, currently the s and w revolver can also do this but the nagant had previously received rpm buffs to make it viable, however the s and w m1917 still has a rpm of 90 compared to the nagants 180 rpm. After seeing a video of the new nagant in action, I think the nagant is in a comfortable place (video can be found in this thread: Gun video request - #3 by Yamoto4299-live )
So I suggest:
•increase the s&w m1917 rpm to 180 in order to be equal to the nagant.