Well I searched and didn'te find anything about it yet, Harrows got a new shaft, the Ronin (cool name). Downside is that it's a whopping $145!, a little pricey for me, doesn't seem too different from their other shafts.
nice find from the looks of it it looks like its retangler near the top for beter grip. Also it looks like the combined the howitzer5 and i beam together to make this too