AR receiver length

[@thewheels]

Anybody know the actual length of an AR upper receiver rail?
I'm trying to get a ballpark sight radius length with a flip up mounted at the end of a 15 inch free float.

 

[GUNSICK]

 

[@thewheels]

Perfect - Thanks Gunsick!

Any cons to a flip up on the end of a 15 inch free float?

Anybody try these?

AR15 Enhanced M-LOK Handguards, Gen 2

 

[WileyX585]

Perfect - Thanks Gunsick!

Any cons to a flip up on the end of a 15 inch free float?

Anybody try these?

AR15 Enhanced M-LOK Handguards, Gen 2

I just ordered an Aero complete 20" upperwith 15" MLOK handguards, I'll let you know when I get it. I have another AR with a 15" free float and magpul MBUS flup sights at the end. Never had an issue with it.

 

[@thewheels]

I just ordered an Aero complete 20" upperwith 15" MLOK handguards, I'll let you know when I get it. I have another AR with a 15" free float and magpul MBUS flup sights at the end. Never had an issue with it.

Nice looking upper. I'd appreciate your thoughts on it when you get your hands on it.

 

[Bulldog51]

could the rail flex and thow off the zero?

 

[GUNSICK]

could the rail flex and thow off the zero?

It would be minimal and they are back up sights. Good enough for me.