QB78D rail question

[pharoah007]

How long are the 11mm rail mounts on a QB78D?

I want to be sure that the scope mount I have is not too long for the 11mm groves cut into the barrel.

Thanks all.

[SeanMP]

4.625 up to the loading port
6.750 overall if your mount spans the port

[pharoah007]

4.625 up to the loading port
6.750 overall if your mount spans the port

Nice, thank you.