When I was switching out the FSB on my SBR, I decided to switch the FS at the same time, and put on a phantom that has the closed slot, but indexed the closed slot to the top, instead of the bottom.
Does that make any sense at all, or is it completely retarded?
Here's my thinking: The purpose of a closed slot in the FS is to avoid any "dust signature" right? Or is it also to reduce muzzle flip? My understanding is that it was primarily to avoid kicking up dust under the muzzle when firing prone.
Well, since I've got a vertical grip on the rifle, and it's more of a fun rifle - with possible home defense application, but not much anticipated "field" use - I don't image I'll be doing a lot of prone shooting, and kicking up dust from the barrel being close to (dusty) ground.
But in some lower light conditions, and when shooting ammo like XM193, I have noticed that there is occasionally a flash that is visible that can be seen through the sight (EOTech). It is MUCH reduced with a regular phantom, as opposed to a regular A2 - but wouldn't putting the closed slot on the top also reduce any visible flash to the shooter even more? (or would any benefit be lost by increases in muzzle rise, because now expanding gas is being directed downward and not up).
Does/has anyone else deliberealy index the closed slot on an A2 or Phantom on the top?