Langenhan Model 2 in .25 ACP.

Here's my entry:

It's a Llama Rubi Plus Ultra in 7,65

Here it is:

http://i2.photobucket.com/albums/y45...scurerifle.jpg

Hint: Picture is NOT black & white. No wooden furniture.

Is that a Chinese JS rifle?

No. It is not.

Hint number 2:
Mounted on aluminum chassis and It weighs about the same as Gibbs' rifle.

No more hints.

I mean Jethro Gibbs...

Gibbs has an m40.