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Here are the measurements for three muzzles I have (LxWxH in mm).
Rob Allen Closed 57 x 56 x 58
Rob Allen open 68 x 37 x 39
Hammerhead 61 x 28 x 34
I like the open muzzles, but definitely would never say they were the best. Just what I like. And, for my RA 130 I still have a closed mzzle. I think it aids long range "aiming"
I won't know until summer whether the sleeker RA open muzzle is any easier to swing, or whether the length of the tube is the limiting factor (quite possible).
Howard
