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I bought a can of 855(green tip) from Palmetto state. They have decent prices. I've also seen it at Academy S&O on occasion.

Well the free float is just that, it's cantilevered out there with nothing to support the forward end. With a KAC rail, you can't deflect it much before you're deflecting the barrel too which is much stiffer. Assuming the barrel nut connection is rigid, then you have no difference between a FF and a monolithic upper. But you still have some deflection. There's also minute differences between the angle of the two rails. I wouldn't bridge the gap ever if I was concerned about long range accuracy that much.

WEC wrote: Your rail is free floating, isn't it? If so, I wouldn't recommend bridging your front scope mount across the gap to the rail. Doing so could result in inability to maintain a reliable zero.

I get what you're saying here. but what would be the difference if it were not free floating?

Nice!

BCM makes an extended latch CH that I have on my AR. Work's pretty well with getting around the optic. Bad part is they are $45.