You can get visible red lasers but to get a red laser visible requires significant output from the diode so much that even if a weapons mounted version were to exist you would toast every-bodies eye balls with it if you accidentally shined it their way. I have a 150mw red laser and it shows up in the air. Most airsoft red lasers are 5mw or less and you don't begin to see the beam until you hit maybe 50mw. Green shows up very easily even at lower output power, red not so much.... Alternatively you can get a fog machine and fill the cqb arena up with smoke a bit and the red laser will show up brilliantly. Downside is if the beam is visible... it just points straight back to you!
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