I would officially advise against illegal trading of guns. That is my official position.
If one has a decent rifle, or a modern submachine gun (obtained legally of course) a scout should be able to operate deep into enemy territory.
Look at it like this. A scout might be ordered to head fifty kilometers into enemy held territory. He is not there to engage targets. Rather he is there to locate enemy positions and return and report to friendly forces.
Perhaps a scout might better be utilized by carrying a radio, and as lightweight as possible that the other necessities are. If I were to say, locate an enemy missile battery, I could radio friendly elements for a platoon level strike.