Internally suppressed 9mm AR

[shooterhyde]

I was thinking of doing something similar, 9mm SBR + can, don't mind doing two stamps and permanent attachment, want to keep it short but accurate. What's a good barrel length for accuracy out of a 9mm? 5, 7, 9?

 

[rico903]

I was thinking of doing something similar, 9mm SBR + can, don't mind doing two stamps and permanent attachment, want to keep it short but accurate. What's a good barrel length for accuracy out of a 9mm? 5, 7, 9?

Because I never got around to building it before the law changed I may be selling my new YHM 7.5" upper, with BCG and CH. PM if int.