I know it took some really long while to finish but those last bits were such a pain in the ass. Modelling of the scope's rubber hood alone took me about 8 hours.
Type 88, a chinese bullpup sniper rifle from Battlefield 2, has animations which should work perfectly with the M42A. At least according to my calculations, haha. I'll try and hurry with the UV mapping, so the gun can actually be exported to the game and I'll let you, guys, know what I found out.
One last thing, I have to mention
an M42A-related forum thread which had a few images of the Scope Rifle's miniature model that gave me great insight when deciding how to model certain parts, mainly the barrel area.
A truly magnificent work by the user named
CAIN MKII.
If he'll ever read this, I'd just like him to know that he's my hero!