Uncommon cards and Advanced Packs

Beforehand, I had unlocked all common cards.
Advanced Pack description states: Contains 5 random items or characters, including at least 1 uncommon, with a small chance for a Rare.

Here is what i observed during my gear progression buying Advanced Packs:

* never got more than 1 Uncommon weapon, character or mod card in one pack
* didn't get a single uncommon weapon mod until all characters and weapons where at X

RNG, bad luck, blah blah blah...
I know it is somewhat possible I think very unlikely to not draw at least one uncommon weapon mod until the store is forced to do it (according to the pack description at least).
There are 60 uncommon character cards, 100 uncommon weapon cards and 80 uncommon weapon mod cards, meaning I bought 160 Advanced Packs and didn't get a single weapon mod.
Either there is something fishy going on or the chances are very very low compare to characters or weapons.

Personally I think, most people wouldn't complain so much about low weapon damage output if they had earlier access to uncommon magazine mods. They only seem to drop (for me at least) after maxing out all other Uncommons or buying higher priced packs.


What are your store experiences?