B21 rail mount?

[Bad1Brad]

I was moving from house and my son asked where the scope for the B21.  Looks like the rail has been removed from the gun.  What would be the replace ment for the rail.  Looks like 2 lock down screws up front and 1 thumb screw in the back.  what is the tread and screw size for the rail.  I have found the Diana 48 parts picture but no info for the rail or screws.

[Roadworthy]

If you want the scope rail or screws try https://twchambers.co.uk/airgun-spares/diana/original/gecado/48-to1/.  Unfortunately the scope rail is out of stock.  I don't know the length of your scope rail.  The T01 and T05 Diana rifles had a shorter rail.  When they went to the T06 the rail got longer.  I'd have to take some measurements to see if the screw spacing remained the same.  Although Chambers shows the rail mounting with screws I believe most were actually held with rivets.

[Artie]

Not sure what gun you are referring to. Are you talking about the Chinese clone of the D48 i.e.. Xisico BAM "B21"?
If so and as I recall, the earliest B21's had an issue with the scope rails coming loose.