Weapon log: Stargate SG-1, Which weapon is most practical for intergalactic exploration?

The primary weapon of choice for SG teams in seasons 1-3 of Stargate SG-1 was the Heckler & Koch MP5A3 submachine gun. Its is first seen being carried by Jack O'neill and Samantha Carter in season 1. The MP5 is a fully automatic submachine gun that fires 9mm NATO rounds. It is generally used for close range engagements since its maximum effective range is 200 meters. In season 4: episode 8 the FNp90 Personal Defense Weapon was introduced. This became the standard issue weapon for all SG teams for the remainder of the series. It is a fully automatic bullpup submachine gun with a top mounted magazine. It fires a less common 5.7 x 28mm round. It's maximum effective range is 200 meters. The FNp90 is definitely an upgrade from the MP5A3 due to the fact that it is ambidextrous and has more powerful ammunition. However, I believe that the best weapon for intergalactic exploration is the Steyr AUG A3. The AUG, like the FNp90, is bullpup in design. Unlike the FNp90, the Steyr AUG features the ability to quickly change barrel lengths thus allowing SG teams the ability to switch from close range combat to medium or long range. The AUG also features a more powerful and common 5.56mm NATO round. The AUG is combat proven and adaptive.

SG operative with a MP5A3

Daniel Jackson with a FNp90

Steyr AUG A3