Hi Roberto
You're almost right buddy. The first production L/48s did have muzzle brakes but in the field and with the gun so close to the ground they would kick up so much dust the crews couldn't get off a quick follow up shot because they couldn't see. Remedy was to remove the brake.
Word got back to HQ and the factory stopped installing the brakes, I think about mid production.
When I build the Production L/48 it will have the muzzle brake removed.
Now you know the rest of the story ;D
Tony lee