Good shooting.
I have to ask if it's open sights or with what optic?
He probably has an S&B on his Norinco CQ.
I think the best way to quiet the masses with their talk of cherry picking one group out of 50 or that it being total fluke is to do similar to what the precision challenges were doing.
Let's modify your challenge to this,
1. Must use semi auto black rifle of any brand. In the case of an AR use any barrel you want as long as you state what you are using.
2. Must use bulk surplus ammo. American Eagle, Winchester white box, Norinco, S&B, PMC etc. You choose whatever your rifle likes best but no premium ammo and no handloads.
3. Must make 5 shot groups.
4. Must make 5 groups on one page.
5. All groups must be done at 100yds or Meters (specify which in your post). Does not count if you shoot at 50 yards then double your measurements. 100yds/meters or nothing.
6. Must provide a picture of the target with your rifle and the ammo used.
For number 4 I mean that you buy the targets that have more than one target per sheet so you can make multiple separated groups on the same sheet. All rounds count. All flyers or pulled shots are included. Make all the excuses you want but all 25 shots count. Any taping over of shots or any holes on the page that aren't included in your groups void that target and you must try again.
If you want to cheat and go ahead you'll know you're a loser and it nobody really cares anyway. We go on the honor system, if you have none that's your problem.
Since we are using cheap bulk no one should have a problem dropping a couple hundred rounds attempting to make 5 clean groups on a single page.
If people want we can put a limit on optics magnification but as long as it's open for anyone to use anything they want I don't know if we really need to put a limit on it.
Feel free to add to the criteria but I like the idea of this and will give it a try next time I'm at the range.