There is an AA-12 mod out there, done by the same Russian author I believe who made a pack of Beretta pistols that includes the Auto9. Me being insane I heavily modded the mod to tidy things up, correct grammatical issues, rebalance stuff and also added the FRAG-12 as an ammo mod.
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https://www.youtube.com/watch?v=WV379084djs
vid starts @ 1.21 min
:-)