From Rainbow Six Wiki
Vegas 2 Weapon Information
| 552 Commando
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| Assault Rifles
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| DAMAGE |
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| RANGE |
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| ACCURACY |
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| PENETRATION |
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| MAGAZINE SIZE | 30 standard
40 w/ Extended mag
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The SIG SG 552 Commando carbine is a gas operated, select fire assault weapon that is derived from the original SG 550, developed for special forces teams. It has a short, 226cm barrel, three prong suppressor, and accepts rails and accessories for specialised optics and attachments.
[edit] In Rainbow Six
At the time of Rainbow Six: Vegas, the SIG SG 552 Commando appears to have taken the role as the standard issue rifle of Team RAINBOW's operatives.
This gun is strange because its damage and penetration drop massively at long range. (It's bullets also spread)
So your best chance is to pump single shots in to their heads.