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2/3/2016 12:19:49 PM EDT
Are there different sizes of Delta Rings?  Maybe Milspec and Commercial spec like there is for buffer tubes?
2/18/2016 4:10:52 AM EDT
[#1]
Nope, they're all the same size
2/20/2016 10:31:20 PM EDT
[#2]
They do make them non round though DS Arms makes one that is more rectangle than round
2/22/2016 6:03:12 AM EDT
[#3]
The original M16/M16A1 had a straight sided Delta Ring


Later M16A2s and other variants uses a tapered Delta Ring


Then DSA sells this


I would imagine that they are the same thickness for the spring and c ring then for the handguards to slip under.

ETA and then you have Ruger


CD

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