I've been working on a Bounty Hunter's off-hand weapon; but then I saw it needed a Particle SMD. Then I created it..
When I see it in lobby, it shows well...
But if I see it in-game (in a match) it doesn't appear and instead of it, it makes a big red-sphere around Bounty Hunter, and then it disappears, and my Weapon has not any particle; but the Right-handed weapon does.

How i see it in lobby:
http://img834.imageshack.us/img834/1513/xcp0.png

What i see it in-game:
http://img203.imageshack.us/img203/4016/l4py.png

Can you help? Maybe I'm doing something wrong with particles, but... I don't know.