here's a first stab at it.
at 1.5" diameter anybody planning to recess this inside a handguard will need a big hallway to throw this hotdog down. Low-profile/lightweight handguards like Maple Ridge Armoury V1 would be a no-go but it would fit in AR-15 huge quadrails or 308 handguards like the MRA X1.
do we have any more votes for
- reverse style or extension style? (extension-style makes fit inside handguards a non-issue)
- linear comp or plain? If it's linear comp then I'd lean towards making it steel to prevent erosion and then you're looking at a 1 pound muzzle device instead of half pound