Gentlemen, forgive my ignorance, but I have a 59/66, but the grenade launcher has holes around the front edge...is this a Kali mod I didn't ask for, or is it the grenade launcher?
ok, well, thought that kali mod required a muzzle brake permanently attached... its definitely not a homemade hack job to clean for that...came from centerfire systems directly anyway.
I have seen a few that had holes, and appeared to be made that way...But my recollection was that the holes were on the barrel end, not towards the muzzle...My memory could be a bit fuzzy though..it happens.
The grenade launchers had holes drilled in them on some of the earlier models, but it was discontinued as they had no real effect other than making the rifle somewhat louder.