Barrel and receiver are blued as well as the trigger housing and oprod.
hammer marked IK sear marked B (with 2 vertical lines behind) mag release EI trigger (chrome or nickel plated marked LT-O LT-C or LT-Q) trigger housing is not stamped or electro penciled but is stamped inland. oprod and bolt marked SG stock,oprod and handguard are stamped w/the last 4 digits of the serial number. the bolt is electro-penciled
Question is how much of this is correct? and/or what is correct?
It's a rebuilt Inland but the numbers on the stock, slide, bolt and hand guard are typical of Bavarian carbines. Normally the trigger housing is also marked with part of the serial number and if not then it most likely has been changed out. Are you sure the trigger has been plated and that it's not just in the white as they call non blued parts?
Depends on your definition of "correct". Since the serial number wasn't provided, the "correct" parts for an original Inland cannot be assessed.
The parts with numbers matching the serial number indicates those parts were on it when it was used by the Germans or Austrians. The trigger housing not having the numbers (look on top of the rear lug that engages the rear of the receiver) indicates it was put there by someone after the carbine left Germany or Austria.
Since no agency markings are indicated, it's not possible to determine if the carbine is "correct" for the German or Austrian police agency that used it.