I assume he wants to match the feed ramps on a rifle barrel extension to a receiver.
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Exactly.. In reality using the A2 style barrel on a receiver with M4 cuts probably wouldn't cause an issue. I guess I could also blend the barrel ramps into the M4 cuts if I had to. I am not having any luck selling the left over parts from the upper I bought for the receiver. See my ad in the EE under AR Parts.
A non feed ramped barrel in a receiver that has feed ramps is not considered to be compatible.
You could try it, but might have issues feeding
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