Great right up!
But,
The pAx comes in different flavors even if you roll it to where you want it.
I have had some amazing Pax's and some with the same rolls, but different stats
in velocity, blast radius, stability.
weird.
the higher the tier your main Guardian is, the better outcome your rolls
are going to be in your weapon (s).
English
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The variations you see may just be the result of the first option available to that Rocket. For example, I can have two shotties that come with different barrels as the first option automatically unlocked, so the different stats apply.