Another rifle from me, just like my last rifle I've tried to make the internal mechanics as realistic as possible.
Shit that you should read first:
Now, the selector switch works, just don't yank it around carelessly or it will FAIL.
Also, the rifle has a bolt catch, so when the last round in a magazine has been fired, the bolt locks back. You release the bolt by dragging down the small lever that pops up inside the trigger guard.
I've tried firing the rifle in every angle, and it works well, as long as its fixed to the background. You can un-fixate it by removing the X on the grip, though the rifle can still fire like this, the reliability goes down a whole lot.
So. Enjoy and please comment.
Edit: The real beauty of this rifle is its internals, take a look during firing.