There is really no reason to do an 'integral'
Not an expert, but internal suppressors seem to run much larger with less ?bulk? as the chamber can be spread out more. Even with a size advantage they are shorter as the can doesn't stick forward. On a PCC(pistol cal carbine) it seems this would be very advantageous as most want them to be short and light. Sticking a "6-8 can off the front is a little counter productive.