A British company called Vorpal Arms manufactures a very interesting looking muzzle brake called SOLO. It is sort of a combination of conical flash hider and a multi-chamber muzzle brake. The SOLO also has external threads, which allow mounting an outer jacket/blast diverter, which covers the muzzle brake to reduce the flash and possibly decrease the report, too. Of course, it comes at a cost of reduced recoil mitigation capability due to less space for the escaping gasses.
This idea is getting popular among muzzle device manufacturers with more and more of them offering a similar solution. In the case of SOLO, it looks to be a pretty large muzzle brake and I think that the blast reducer can perform as a suppressor too. However, it is also possible to mount a Vorpal Zephyr suppressor (“sound moderator” as the manufacturer calls it) over the brake too. And in case if you want to use solely the SOLO, there is a thread protector.
The SOLO comes with following internal thread pitch options: three imperial thread pitches (1/2×20″, 1/2×28″ or 5/8×24″) and two metric ones (M15x1 or M18x1). SOLO also comes with a number of different washers and shims to allow timing it correctly on the gun. Vorpal Arms also suggests to add a thread locking compound to secure it even better. Well, if you are going to stick to their products family only, then locking the threads can possibly be a good idea.
Vorpal SOLO has an MSRP of £120, which is about $150 and you need to add about $25 (£20) for the blast diverter.
Vorpal Arms Limited
Tel: +44 (0)1629 826497