A&K SVD Dragunov (airsoft) Picatinny Rail Mount

Designed this mounting system off of the A&K SVD Dragunov AEG Sniper Rifle (Airsoft) from Evike.
https://www.evike.com/products/56165/

The metal picatinny rail used was the UTG MNT-P503 Tactical Picatinny/Weaver Rail (with M5 bolts inculded):

https://www.amazon.com/UTG-MNTP503-Tactical-Picatinny-Weaver/dp/B002GNYCNU/ref=cm_cr_arp_d_product_top?ie=UTF8

(This is just an example of the rail that could be ordered, the listing that I ordered from no longer exists but the idea is still there)

The threaded inserts used were:
Quantity: 2; M5 x 6 x 7mm
Quantity: 1; M4 x 4 x 6mm

https://www.amazon.com/gp/product/B07VFZWWXY/ref=ppx_yo_dt_b_asin_image_o00_s00?ie=UTF8&th=1

With a hex socket head metric bolt as a set screw:
Quantity: 1; M4 x 12mm

https://www.amazon.com/gp/product/B0BKZWWTJY/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&th=1