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Old 11-21-2013, 08:29 AM   #1
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Default Upper receiver question

OK, while I used to build and repair AR15s, all we had back then was the A1 and the A2. So, can you put mount an A3 upper receiver with barrel that has the M4 feed ramps? Will this work or will the lack of feed ramps on the upper cause feeding problems? Like I said, all I've ever built were the A1 and A2 rifles and carbines.
I would be thankful for any help here. I have looked and the other theards and haven't seen anything about it.



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Old 11-21-2013, 11:04 AM   #2
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I know someone will correct me if I'm wrong but I do believe if your barrel has the m4 feed ramps but your upper receiver lacks them you are good to go. It's the opposite configuration, standard receiver and M4 cut barrel that creates a gap that the point of your bullet can snag.

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Old 11-21-2013, 01:19 PM   #3
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Take out your Dremel and carefully cut the A1 receiver to match the barrel.

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