Shooters Depot have developed an interesting suppressor design called the ARIES system. The actual suppressor is held two inches ahead of the muzzle by a free floating over-barrel heat sink.
The Carbon Fiber heat shield tube attaches to the threads in the back of the barrel (by the receiver) and the front of the tube has 4 metal protrusions to keep the tube aligned. These protrusions are touching the barrel also working as an effective stabilizer for the barrel’s harmonics and the extended tube is also working as a flash hider when the suppressor is not attached. The major benefit of the system is that the suppressor is attached to the threads inside the tube and stays 2 inches away from the barrel, not adding ANY weight to the muzzle (the weight is transferred to the thread near the receiver) so there is NO POINT OF IMPACT CHANGE.
This design does not come cheap with prices starting at $2500!
Big thank you to Jesse for the link.