Throughout the Stargate Altantis series, the badest-ass weapon on screen was arguably Ronan's powerful gun.
Where and how did Ronan get his iconic pistol?
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While we never find out the backstory of HOW Ronan got his Particle Magnum, we do know that it is a standard sidearm of the Travellers and is manufactured by them. The most likely scenario is that some point after he was released as a runner, he by chance came across some travellers during one of the incredibly rare occurrences where they land in order to gather more supplies.
Scenario 1: Shortly after he meets the Travellers, the Wraith show up, attacking them. The Travellers throw him a Particle Magnum to defend himself with, and after they kill the hunting party, the Travellers allow Ronan to keep the Magnum when they part ways.
Scenario 2: The Travellers associate him with the Wraith, being a runner, and start an altercation. Ronan defends himself, knocking out/killing the Travellers. He helps himself to the spoils, including a Particle Magnum.
I find it's best that we don't have a proper backstory for that particular weapon. That way, everyone can come up with their own ideas, much like the Joker's scars. Personally I like scenario 1. It seems the most likely and paints Ronan is a positive light. He also gets to kill Wraith.