Awesome video by Bret Golihew (of the KL and KBA) on his SMG 68 Carbine (hope he doesn’t mind me representing it with a screen capture).
And the thread on mcb:
http://www.mcarterbrown.com/forums/first-strike/233304-tippmann-smg-first-strike.html#post2706539
He shows it cycling full auto with standard paintballs and with first strike paintballs.
Find this post on facebook at:
https://www.facebook.com/photo.php?fbid=448232191937428
Find Dan on google Plus at here