This is what I ordered for bigger guns :
SWEET SERVOS & MOUNTS
Should have it built out in a few days depending on shipping times.
The trigger part will change depending on the gun you want to use, but the gun I use is just for safety while developing.
Imagine a Tazer on the turret with a laser site, you shoot and zap the thief until the cops arrive. He will never forget his visit to your house while rotting in jail (maybe next to your cell for shooting him, but that is another matter =)
Hey, If you live out in the country or North Korea and want to put an AK47 on there, It will work, just get stonger servos.
This setup would be about $200 with decent servos, but you are looking at $400 to control a real assault rifle =) I will have about $300 in parts on the next model. Don't take the prices too literally, but just know the only difference in your application is the price of servos and the gun itself.
Anyways, the video got 27K+ hits today, so I hope some people come and visit here. I got a volenteer to help with my site, so hopefully it may stay current and get some upgrades soon.
Vaughn
vCrib