Well, Stargate takes place in current times so Earths weapons what we have in reality. SG1 had various episodes dealing with the Allies of Earth (especially the Asgard and Tollan) not willing to share advanced weapons technology, but they had less problems sharing tech such as hyperdrive and beaming technology. Before the final episode of SG1, the battleships of Earth only had projectile weapons as well.
In the final episode of SG1, the Asgard give all their technology to Earth before they commit mass suicide and only then Earth's battleships are outfitted with energy weapons
Jaz
BTW, The Asguard
Are Alive and Well in Pegasus
I know

Was a fun episode.
Jaz
Stargate Extinction was supposed to be Atlantis + Asgaurd + A Seedership and some new enemy / plot curve.
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