Photo of the bore. at this link
Looks like someone went to rifle the barrel and just forgot to spin it during the process. so there are lands and grooves, but they run straight down the barrel with no rotation.
I guess it would be OK for use inside a structure aty close distances.
It is a bit spendy for a SBR, cheapest one lists for 1050.00. Mine cost far less to build even with the price of the stamp, and it can even impart a rotation to the projectile.
Got to admit I appreciate their creativity and efforts to stretch the norm.