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Here are two videos taken at a Machine Gun Shoot in Lancaster PA. I attended the shoot with 3 of my four sons. I put my Colt Commando 6933 Upper on my Colt M16 Model 901. It worked flawlessly with the 11.5" barrel.
Dane
PS: I ran out of battery life on my cell phone so there are no videos of me shooting it with an AAC Suppressor.
Colt m16a1 - YouTube
Colt m16a1 - YouTube
Quite a flame on that...but they both worked perfectly...just like we want.
Odd small flames way from everything a couple of times. Thought it might be from ejected cases, but also (and more probably) might be from the brake.
Have not shot my 16 in quite a while. At least not in "go fast" mode.
Attachment 54192The flame is from the AAC brake/suppressor mount.
Here is a picture of my Colt Commando with the brake/mount on it. It is loud and has lots of flame from the unburnt powder due to the 11.5" barrel,
On the upside, you have the break to mount the can...that'll calm it down a bit.