I am curious as to the similarity to the Steyr pistols also. Many features appear to be a direct copy.
I agree with marflow that the rear sight mounts over a rib which appears to be the same as the Steyr LP and EVO 10 and the LP50.
You could remove your rear sight easily as it only mounts with one screw. Measure the width of the standing rib underneath and if it's 6mm (.236", just under 1/4") you are in business and the Maple Custom Products mount will fit! This mount would be better with a red dot due to the cocking lever getting in the way. A scope would have to be positioned well back to clear and likely only use one ring as the rail only has 4 cross slots.
It also appears that the barrel shroud is like the Steyr pistols which would accept this weaver mount:
This short Steyr weaver rail is made for the Steyr LP10(E) and LP50 air pistols. Made of anodized aluminium.
www.krale.shop
Order two of them to mount the scope rings and position the scope in front of the cocking lever.
Best of luck with your new pistol Charles!