I'm looking around to buy a magnifier on my sight mark reflex sight. My question is I have a carry handle that I'm putting it on, how far behind the sight does it have to be, I don't have alot of room on the handle.
You're putting a carry handle on a flat top rail? I wouldn't use it for optics, just keep it as a spare or when you want to go retro and instead use a flip up BUIS with the optics.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together. You'll remember the quality of a gun long after you forget how much you paid for it.
US Army 1966-69, VFW Life Member, Retired Geek