I see a mix of everything. Part of my job is dealing with gun specific crimes, shootings, robberies, gangs, etc.
Most everything I find/recover are stolen firearms. Every night we have multiple car burglaries where handguns are stolen. We get a lot of Glocks, Shields, smaller Rugers, Taurus, etc. Anything people leave in their cars. So a mix of everything. Ammo is a mix of what was stolen or traded. Most mags are mixed ammo, steel case FMJ with hollow points as well. I’ve seen guys shot with Tula and Hornady Critical defense from the same mag. I’ve recovered guns with lights, lasers, extended mags, drums, as well as optics. Found a Gucci Glock with Zev upgrades. It had an RMR and the “dick” (33 round mag)
Rifles: I just helped a case where 3 AR’s were found. Bushmaster 16” carbine with Eotech, a DPMS with stainless bull barrel, and a Spike’s lower with a 7.5” upper. Somewhere in that rifles travel someone put the short upper on the lower. All 3 were stolen. The Bushmaster had 2 mags jungle-taped together. Mix of steel case Tula, Wolf, and brass cased Federal. We get a lot of shootings with 7.62x39, mostly steel cases. They love the Draco.
I’ve found some really nice guns. Found a Colt 1911 in a dirtbags house. I did some research on the gun and it was made in 1913.
Found lots of shotguns, Mossberg 500’s are probably the most common. Did find a KSG months ago.
So whatever is stolen from homes and cars is what we typically get from thugs. I’ve seen some pretty nice stuff as well as stuff that was cheap or not worth anything.