For those that are not familiar, the Brekke Custom CompXtension is a pin/weld muzzle device used to reduce dwell time and is gaining popularity within the PCC competition community. It makes the barrel behave like a 10" while keeping the oal to 16". Also, since it is pinned and welded, it is no longer possible to use a suppressor.
Looking at the Brekke device, I see the resemblance to how an integrally suppressed rifle is built -with additional baffles and a sleeve. Which made me think: Can I have both? Are there any monocore suppressor designs feasible to be utilized in an integrally suppressed rifle -both with and without the sleeve mounted?
Pro: Quiet time with the sleeve on, competition time with the sleeve off.
Con: Hand/handguard exposed to muzzle pressure leading to discomfort or damage when the sleeve is off.
To question the con: 9mm muzzle pressure is pretty low compared to 223, but is it low enough to not be an issue in a design like this? The Brekke device starts as a 3-port upward facing brake, and thus the handguard is cut to let those gases escape. The rest of the device however can be tucked when a traditional HG is customized.
Worth noting is that where I live suppressors are not regulated and free to buy/make/use. Rifles, barrels, bolts and receivers however are regulated, and parts accessibility is somewhat limited. Barrel length needs to be 16" -SBR or pistol is not an option.
Some images for illustrational purposes. (please enlighten me if there is a better way to embed pictures, this is not what I had in mind)