Gap between free float & receiver ?

[gunnutery]

I did some searches here and through google and didn't find much other than "bridging the gap" with optics.

My question is whether one should or should not have a gap between the free float tube and the upper receiver? Or does it matter at all?

I bought a PSA upper with an SQR free float tube. I took it off to check all the parts underneath the hood. When I reinstalled the tube, I couldn't remember whether there was a gap or not. I currently have it tightened down with about a 1mm gap.

 

[C-grunt]

sometimes there is a slight gap, sometimes not. Depends on the rail, barrel nut, and receiver specs. As long as everything lines up you are good to go.

 

[taliv]

some rails specifically say in the instructions to leave a gap. couldn't speak for all of them.

 

[gunnutery]

PSA didn't send any directions. I think BCM might make the SQR rails for PSA but I'm not 100% sure.

 

[Mohave-Tec]

Rather common.

 

[gunnutery]

Okay, so I did a little digging/googling. I think I've found that it's made by CIM Tactical.

http://www.victorydefense.com/detail.cfm?productID=9093

I'm going to try to contact them and see what's recommended.

 

[Tirod]

Depends on the tube, some even have ears that overlap to index it.