I guess it'll work for paintball where the effective range of marker is around 25m-30m, but if you are using real guns, M16A2s or M60s, well, that's a dangerous tactic because you are shooting at each other as well as the enemy. If you close within 20m, it is still possible to nail other teammates so I don't advocate tactics like this unless the engagment range is outside 25m (more if you have Flatlined players).
Good tactic-
One player will fire a 4-6 round burst while the other aquires a target and switch off. Usually 3-4 rounds are used but due to the lack of accuracy of many guns, this is not practical and the fact that balls might not break
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PinkPegasus