I got a really good deal on a upper receiver and I am almost positive it will not have feed ramps, but I can't verify if they have them or not. Most of the barrels I would like to get have M4 extensions.
Quoted: While doing some manual feeding/testing after having my M4 barrel installed (handn't shot it yet), I had a feeding problem so I had the gunsmith just go ahead and dremel out the cuts into my upper receiver for the M4 feedramps (he used a craytek bit). I haven't had a problem since, live fire or otherwise.
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I copied this from the other post I got my pics from
"The only thing accomplished in this picture (not attached by me
) was some of the protective hard coat anodizing was removed. This unfortunately, is what many people consider to be “M4 feed ramps”. They are not. "
The pic showed a M4 extension in a non M4 cut upper receiver. It looked OK but I want to make sure I will not have to do this.