The integrally suppressed model is the only one that rotates.apparently now the Kel-tec barrel rotates so you can run an optic.
SUB CQB | Folding, Suppressed Carbine in 9mm | KelTec
The SUB CQB offers compact storage and superior pistol caliber firepower. Integrated noise suppression gives a tactical advantage over evil doers.
www.keltecweapons.com
I wonder if Keltec will bring that feature to the standard model when the current rebate ends.