In the TOS from the website they mention how the guns kinda work, for those interested.
Spoiler!
Click because it's huge.
https://i.redd.it/knleeqia14sx.png
So it sounds like they may all fire reduced velocity. We saw the one guy get shot and bruised. I'd imagine when they hit a host, they trigger the blood(and death). Which is interesting, because we see Delores over-ride her getting shot. She must have bypassed the bleeding code. So it all makes sense now.
Also a mention about VR recording devices being banned in the park.
