I felt like making a new gun, and I couldn't find a G3 on here, so I started building one. I made the SAS, the SMG version (basically an MP5 that shoots a higher caliber bullet. It shoots blue rods about the same distance as any other mag pull back. The trigger is quite far back so it may have higher power with less elastic bands.
I would build a stock but it would block the bolt/charging handle.
I will probably post it in the next week, as there is no school =D