Here's an easily reproducible glitch for you: reload and then switch to blaster while reloading.
You can't use the blaster for the entirety of the reload time, but the gun isn't reloaded when you take it back out.
If you have exceptionally bad timing, you'll have the reload time for the rifle, then the blaster will come up and go directly back down to the reloading "animation".
Is this in any way intentional?