Bindi2 pointed out the metal misses a part, but also the stock on the left side has a half circular hole. The cut for the front portion of the stock was also not professionally done. I therefore had suspected it might got damaged when it got re-issued, the heavier damaged front handguard portion got removed and therefore then put aside since no parts for repair were available and survived this way in a rather untouched condition. But all just wild guess and thoughts.

Magazine is simply removed, you could easily insert one. The swinging floorplate locks identically to the original magazine.