Complete parts breakdown incase anyone researched or collected info for research info. I found limited info on BCD 42 rifles, and most pronounced things was seemed to use allot of contractor parts to assemble rifles around this time from what I read.
Receiver: BCD 42, eagle swastika 749 top, 4884 0, eagle swastika left "1" right
Ejector: "k" 84
Barrel: FN16/11 1941, eagle swastika left, waa613 x 3 right
Front sight: eagle over 18
Bolt: 4884 o top of bolt handle, eagle swastika rear bolt handle, "1" bolt handle
Extractor: eagle over 18 collar, 84 on bottom near lug
Bolt shroud(right term where safety is?): 4884 top, "e" right
Safety: 4884 top, "e" under
Cocking piece: 4884 next to "e" rear, "4" on rear sear
Firing pin: 4884 sideways b(?)
Rear sight collar: "a" next to eagle over 1b on right (didn't remove rear sight assembly)
Rear sight base: 4884 below sideways "4"
Sight spring: "S"
Rear sight ladder: 4884 (no other marks can be seen)
Rear sight slide: 48 on left v notch 84 on right
Rear sight slide button: 84
Front sight Hood: unmarked far as can tell
Bayonet lug: "e" no other marks visible assembled
Band spring: "j"
Rear band: 48 84 left side, upside down "1" and eagle over 1 on right
Recoil lug: "f"
Buttplate: brg waa497, ink stamped eagle swastika inside
Trigger housing: waa623 over 4884 (Steyr provided)
Magazine plate: eagle over 1, "1", 4884
Follower: eagle over 1, "1"
Follower spring: "k"
Trigger guard screws: unmarked
Trigger: "e"
Trigger spring assembly: eagle over 18x2, 54 (consensus factory goof mistaking 5 for 8 or vice versa)
Buttstock: br 4 33 42 under buttplate, c waa(can't make out number on bottom toe, 4884 in barrel channel
Handguard: 4884
Cleaning rod: 12.5" marked 84. Matches finish on wear and corrosion