i have a rail mounting problem

[460or338]

im getting a red dot this wekend to mount and the holes from another rail dont match so does this mean one is picitanny and other is weaver ?. i think mine is STANAG 2324.

one in my hand is what im looking for but complete bar not modules

here is A picture

 

[J E Custom]

It looks like the rear screw spacing in your hand.

Front and rear base screw spacing is different.

you will have buy a complete base that fit's your rifle and saw off the end you want or use the
hole base.

Screw spacing is also different from rifle to rifle.

J E CUSTOM