And looking at the pictures again, I don't think it's for peeking around corners. Probably more for keeping an eye on your buddies movements behind you.
Apparently it's a hundred dollar rear view mirror for your rifle.
http://magwedge.com/products/rifle-a...ror-accessory/
Not a chance it's for peeking around corners. It is a bad idea if you think about it. You never stick your weapon into an unchecked space, which you'd have to do to get the mirror far enough to give you a view around a corner, given where it's mounted in the pics.
BUT!!! If you get that picatinny muzzle break, THEN mount this to it... it might work. That'll scream 'bad ass.'![]()