I rented a GSR. It was dirty. It would not run more than 3 rounds without a malfunction. Did I mention it was dirty.
I had 100 rds of ammo for it and practiced clearing it more than shooting it. I was so proficient at clearing it my brother usually couldn't tell I was clearing it. Good training, not a good shooting experience.
Did I mention it was dirty. Only reason I can come up with for it functioning so poorly.