This seems to be a rule everywhere that rents guns - don’t want anyone kB’ing their guns with fireball handloads or running corrosive milsurp through 'em.
The folks and Eagle are excellent to work with on this. They are also willing to talk about any maintenance issues with the range rentals if you have questions about reliability.
And they are probably a good place to have an idea on maintenance needs. Their G19s probably get more use in a year than mine has in the last 22 years.