Seriously, My now 8-year-old, $200, eMachines desktop with 512MB of RAM and an early 2000s era graphics card designed for a LAPTOP could handle loving everything in Blockland. Multiple 6k+ triangle count weapons on a healthy sized (~20k bricks or so) build and around 6-8 players was commonplace on my server and I never once had noticeable framerate drop. The only time I EVER lagged was when I'd spam the forget out of emitters and get the particles really close to the camera, or when I'd open the console and make the Shard-Gun fire loving mininuke missiles. It wasn't a good machine by any means but I took good care of it and it's still going.
If your system can't handle detailed Torque guns it's your own damn fault. Take care of your system with regular internal cleanings, getting rid of old files you don't need, defragmenting, and a bi-annual reformat of the boot partition and you'll never have any issues, inside or outside of the game. I guarantee it.