For both QD and Hub suppressors, we prefer the AI NANO. However, any Plan B type muzzle device with 1 x 16 LH threads would work provided it stays within the following measurement parameters:
For QD models, the measurement is from the .880" basic dimensions on the taper to the blast baffle. For HUB models, the measurement is from the shoulder of the 1.375 x 24 threads to the blast baffle.
556K QD: .83"
556 HUB: 1.75"
6RX: .86"
65P HUB: 1.70"
762K HUB: 1.70"
762 HUB: 1.74"
762P HUB: 1.70"
86K HUB: 1.75"
The 6 RX has an ID of 1.050 which extends 2.16" rearward from the crown. It will fit on any 6mm barrel or smaller that meets those parameters.