Firing line used to have tons of stuff to rent (haven't been/heard in a while)

Green Mountain family shooting center is a top of the line place that used to have just about any glock for rent (they have changed hands since I was last there so things could be different. Note: do not confuse with green moutain guns which is just a shop...a good one at that with good prices).

If you want outdoors, chery creek. Call them first as their rentals may not be what you are looking for.

I typically just drive out the hills and shoot for free. again, if you want to get together sometime, let me know. Got a few you could try out if you want.

when you make a trip up to Loveland, make sure to look up Jensen arms. Great prices/selection, but staffed with the most unhelpful blow-hards per square foot than I have ever seen at a gun shop (and that's saying something).