Algodoo

Well, it's good for a beginner's gun. It loves to jam on the last three rounds. take a look at some of my tutorials, and see if you can put yourself up to the task of making it run entirely off the recoil of the cartridge going off. 9/10

Phil, I hate saying this, but your guns also jam on the last three rounds
It seems good, but it needs a blowback system of some sort, and less strenght on the bullet springs

Just updated.
V.2
Desing changed.
Open/Free bolt added (blowback system)
Other problem fixed
In v.3 Ill make a some sort of desing. Make sure you are 400Hz+ simulation

It doesn't shoot properly. An open bolt gun has somewhat a retarded primer, I mean that when the round gets chambered the pin should start moving forward
Also REMEMBER THIS: if you make objects MUCH heavier (like density 50 or 100) they will collide MUCH better! Use it in everything, for example in each round.