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Thread: A2 Flat Top Upper

  1. #11
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    Quote Originally Posted by 3 AE View Post
    I'm a bit confused. Isn't the A2 upper receiver the one with a built in carry handle that has a rear sight that has both windage and elevation adjustment and the A3 and A4 incorporate a flat top picatinny rail? A2 + Flat Top doesn't compute.
    A3 was a full-auto Navy variant that shouldn’t even be referred to because they were built on A2 and A4 uppers.

  2. #12
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    I assume he wants to match the feed ramps on a rifle barrel extension to a receiver.


    Sent from my iPhone using Tapatalk

  3. #13
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    Quote Originally Posted by hk_shootr View Post
    Correct, if the terminology is confusing to you, ignore it.

    The OP is looking for a flat top upper, that does not have feed ramp cuts.
    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.

  4. #14
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    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

  5. #15
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    Quote Originally Posted by GH41 View Post
    Do any of you guys know of a source for an A2 flat top upper (no M4 ramp cuts)?
    PM me. I have a stripped no-ramps Rock River flat-top that should do what you want.

  6. #16
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    Quote Originally Posted by hk_shootr View Post
    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
    You can cut the feedramps with a Dremel.

    I haven’t done it a long time but it’s an easy fix. We used to do it a lot back in the day when flat tops were just becoming common.

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