Pretty much the title, Obtained Both IZH-43 Shotgun & Blaze 95 Double Rifle, Loaded the IZH-43, Pressed the "T" button For the IZH-43 then fired it, end result, it only shot off one round. Then proceeded to repeat same steps with the Blaze Rifle which ended with the same results.
Not sure if this is the case for other weapons that can be toggled, but concluded that this is currently happening with both the IZH-43 & Blaze.