My Killbillies stock measures a fraction under 13.5" from butt to trigger (when on the shortest setting). Extending it further made the pistol grip to trigger distance uncomfortable for me. Comb height is adjustable, but cheek support is further rear than I'd like.
Build quality is excellent, after running a few hundred shots this is my ergonomic feedback:
1) Pistol grip works well, thumb and wrist sit naturally. Takes design queues from Big Badger 30-30 or 410.
2) Extended forend works and is free of barrel, I was able to bag rest without issue. Accuracy was sharp.
3) Offhand shooting is comfortable, accurate, fast to target. Lots of support hand options. Feels solid, good balance.
4) Reloading stance is easier because of proper grip on the forend when opened, plus the ammo quivers help. I was able to maintain ~5s cadence.
5) Transportation is improved with the clip-together feature. The firearm can be locked with a cable. Various sling options become possible.
Some negatives remain. It's still a niche firearm, and getting heavy for the backpack role (@4lb including furniture). Looks better than factory but still utilitarian ugly?
Worth $100? If already into $250 for a Little Badger that sits unused, I reckon so.