Accatran MG Mk II Heavy Laspistol should regain it’s Run ‘n’ Gun blessing again.
In the past, it was built in. Then it was removed, alongside the blessing. While it is technically possible to have the blessing on the laspistol right now, it’s only possible if you kept one from a long time ago.
Whether or not it’s a bug or removed for whatever reason, the blessing itself with patch 13 actually makes it a good pick with reduced spread and increased close damage so the blessing should definitely return.
Why don’t they just make run and gun a feature of all pistol sized weapons? They could add it as a blessing but I wouldn’t consider it competitive enough to ever take that over the other blessings on offer.