M4 feed ramps

[Quake]

First time building a AR upper
So im assuming i can use a m4 feed ramp upper receiver to a m4 feed ramp barrel ?

 

[BUFF7MM]

This picture will pretty much sum it up

 

[Quake]

Thanks, Seems i waited to long and BCM just sold out of the blemished m4 feed ramp upper receivers.

 

[outrider58]

Just make sure you don't "dremel" through the aluminum receiver when addressing the feed ramps. That would be bad. Go with one or the other of the top two pics. use a stylist to make sure your M4 cuts are deep enough on the barrel extension. You don't want any hang-ups going from aluminum to extension.

 

[Quake]

Thanks for the info