Question on Colt A2 20" upper with M4 feed ramps

Quote:

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Originally Posted by scottryan

That upper has been modified by an aftermarket party. It is too old to be relevant to any other discussion in this thread.

Colt only did non-anodized feedramps during 1999-2000ish on some 6520s.

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Can you explain further?
I should note that the feed ramps appear to be anodized, and I think what you're seeing is a reflection.

Quote:

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Originally Posted by masakari

Can you explain further?
I should note that the feed ramps appear to be anodized, and I think what you're seeing is a reflection.

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A 20" rifle of that vintage should not have any extended feedramps.

The only 20" rifles that ever had extended feedramps are the current AR-15A4 and some neutered postban 6601/6700 HBARs.

If the feedramps are anodized, then that upper was removed from a fixed handled carbine and was mated with your barrel. That receiver was from a preban gray 6520 carbine made around 1989-1991 with a large front pivot hole.