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2/16/2012 4:19:45 PM EDT
I found a Bushy today with what at first appeared to be an A1 upper as it had the A1 sight assembly, A1 forward bolt assist hanndle, but had a brass defloected machined into it like an A2. Does anyone have any info on the variant? Just the first time I have seen it.
2/16/2012 5:36:24 PM EDT
[#1]
Sounds like a c7 upper receiver
2/16/2012 8:21:18 PM EDT
[#2]
Was a common and popular option before Aimpoints became popular.  An A1/C7 upper "upgraded" with the A2 or even a same plane rear sight was "state of the art" on the old AR15 email lists.
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