Friends just directed me to https://www.deflectorbrake.com/ and I ordered a pack of 4 deflectors that come in a nice case you can carry with your shooting gear.
I immediately recognized the importance of these as hot brass ejection was identified as a problem in 1983.
http://looserounds.com/556timeline/556dw-1983/ scroll down to February 1983 and read the background.
I got a pack in and put one on a PA10 (Palmetto Armory AR10) and trimmed a tad off the top and this deflector is a little smaller than my AR15 deflector bumps.
Went out and shot it and cases are all towards 1:30/2:00 and every last one looks like it was fired in a bolt rifle. No dented mouths, gouges in body etc.
I had made similar from two part epoxy putty but at a higher cost for other ARs I own and not nearly so neat. Won't be doing any more of them for sure now that these are available.
If you shoot with others you won't have to worry about hitting your friends with your hot cases and other negative aspects occurring.
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