Mystery Bantams

[MROO]

If you don't have hens, or if you keep your boys in a separate coop and run, is an all male flock less likely to fight?

Yes, they have their own coop and run. The run does share a small (3X4 ft) hardware cloth wall with the main run, but that hasn't been an issue.
You have an advantage in that all of your boys are bantams and have been raised together. Mine are also banties - mostly Nankins with a few random others 4 - OEGB, Silkie, d'Uccles, etc. They've always gotten along, even when they were multiple ages. There were occasional spats and minor blood-letting, but not much more than you'd see in a mixed flock.
At my "highest" point, I had nine fellas together, ranging in age from 6 months to nine years. It was, by FAR, my favorite flock! Watching them was like having a hidden camera in a frat house - the games and teasing were near constant ... and the eye candy was FABULOUS!

 

[ChickenChick46]

Yes, they have their own coop and run. The run does share a small (3X4 ft) hardware cloth wall with the main run, but that hasn't been an issue.
You have an advantage in that all of your boys are bantams and have been raised together. Mine are also banties - mostly Nankins with a few random others 4 - OEGB, Silkie, d'Uccles, etc. They've always gotten along, even when they were multiple ages. There were occasional spats and minor blood-letting, but not much more than you'd see in a mixed flock.
At my "highest" point, I had nine fellas together, ranging in age from 6 months to nine years. It was, by FAR, my favorite flock! Watching them was like having a hidden camera in a frat house - the games and teasing were near constant ... and the eye candy was FABULOUS!

This is good to know. I plan to buy all of mine straight run, so if I can keep a bachelor flock happily, I definitely will.