Returning player from Final Shape. I've been playing catch-up on DLCs, and I've noticed all of the Renegades weapons are disproportionately likely to drop with Chambered, Extended, or Full Bore barrels, with Corkscrew being rare and Smallbore being downright nonexistent. Hammer-Forged and Polygonal seem less affected. I've also noticed disproportionate odds on other weapon drops outside Renegades, where some perks are weirdly nonexistent for drops. However, I've not been keeping track of those beyond anecdotes. The Renegade weapons I can speak with certainty on.