I know there are not a whole bunch of USAS-12's out there, especially since they are SO dangerous to the safety and security of the United States 
, but...
If anyone else is living large and using these 20-round 12 gauge shotguns for three-gun matches, it probably didn't take long to realize that the sights stink. Although you can use a standard AR15 carry-handle mount, that leaves the sight WAY up in the air. So, I designed a few of these custom-machined 'scout' mounts especially for the USAS-12. The only thing better is to rebuild the upper as a flattop (I'm working on it
)
http://www.dreadnaught-industries.com/images/file/guns/USAS_race.JPG
Alex
, but...If anyone else is living large and using these 20-round 12 gauge shotguns for three-gun matches, it probably didn't take long to realize that the sights stink. Although you can use a standard AR15 carry-handle mount, that leaves the sight WAY up in the air. So, I designed a few of these custom-machined 'scout' mounts especially for the USAS-12. The only thing better is to rebuild the upper as a flattop (I'm working on it
)http://www.dreadnaught-industries.com/images/file/guns/USAS_race.JPG
Alex