Just got it back.  Haven't shot it yet.  Will rectify that mid November (outdoor range with steel cased surplus).  

So what the optic costs as much as the base pistol.  

can you tell me more about the optic mount

It replaces your whole rear sight base.

Badass. What muzzle device is that?

How are you liking the KOP system? I'm a gnat's ass from ordering it myself for a current build.

Not going for a cheek weld, I take it.

I've only taken it off once.   Haven't shot the gun yet.   I've got some time in Novemebr so I can shoot it outdoor.   Seems super solid in the brief time I've handled it.   It slides on and then has a large pin with a detent holding it in place.  

I needed to get it engraved and the rear trunion put on, so I needed to drop it off.   I can't do that part.   So I thought what the hell, may as well get it cerakoted and put on the rail.  

The H1 I robbed off an AR.   So the LaRue mount was already on the optic.  I may use a different mount to lower it.  Dunno until I shoot it.

Edit.   It's a flaming pig in metric and 7.62 (obviously).