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AR15.COM
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2/3/2016 12:21:11 PM EDT
Are there different sizes of Delta Rings?  Maybe Milspec and Commercial spec like there is for buffer tubes?
2/3/2016 12:28:00 PM EDT
[#1]
Nope
2/3/2016 12:53:05 PM EDT
[#2]
There's In-spec and Out-of-spec

2/3/2016 3:24:46 PM EDT
[#3]
There's also parallel sided slip rings ala m16a1.  Delta ring was introduced with the m16a2 and is still the current pattern.

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