Wanna put real part in your Hudson Garand modelgun?
It's possible and really easy, no fittiing or machining needed
a short list of part that can be quickly exchanged
feeding and operation assembly
Bullet guide (not sure, didn't tried)
follower arm
follower arm pin
follower and follower slide assembly
follower rod
follower rod catch and accelerator
Clip latch assembly
clip latch
clip latch pin
clip latch spring
I did it and since, it works really much better, particulary the clip latch and the follower/follower slide assembly that are really fragile.
I'm sure it's possible to do the same with the exctrator.