You may get away using one Gemtech LID for your 45 and 9mm AR. You will need a extra piston and a PBT(Piston blocking tube) which replaces the spring converting the Gemtech LID to a fixed mount. The LID is threaded for a B-tube.
On the other hand if you use a D tube you can attach a D- size Gemtech Lid /Liberty Suppressor Recoil Booster Rear Thread Protector (SDTA) to hold the suppressor innards in place and legally switch LIDs with fixed mounts.
Liberty suppressors only sells fixed mounts and LIDs. I don't think they have a PBT. Gemtech has LIDs, fixed mounts and PBTs.
Will the other Gemtech mounts screw directly into a B tube? I have a Gem Tech Multimount and a lot of mounts for it. I am most interested in being able to use thier 3 lug mount.
Thanks