I used a TM springer G3A3 the whole first year I played. It's a bitch to cock prone bacuase the cocking handle is so far forward, but it had decent accuracy - I could consisently hit a 13" tire at about 45 yards shooting .25's. Velocity is nothing special - just under 300 fps IIRC.
Is it good as a skirmish gun? Not really, unless you're playing against only springers. Then again, it's really nice to have in a "springer-only" game