Algodoo

Finally, someone who also does blowback weapons
This weapon operates rather flawlessly.
BTW The guns name is the OC 14 Groza

Very nice, especially for a blow-back

the only suggestion I have is make an auto sear of some sort. maybe make it select-fire as well??

This one's very good! (But I always find ways to improve things here )
Just try this:
add a little bit more way to the bolt (0.4 m would be just fine) and put restitution to the part that limits the backwards movement of the bolt and to the bolt (I use 1.0 restitution on the two if the construction is sturdy enough, otherwise you can try 0.5 or less). that will increase your fire rate, and if you manage to chamber the round 0.3 or 0.4 meters less, it will work even better!
I always think like that because that's what I try to do here: guns with higher fire rate and low frequency, and, if possible, close-to-reality mechs

10/10 anyways!

Breh!
I like the consistency of the Gun.
Most other guns break down randomly