Originally Posted by lunarmanathome
Those aren't misaligned feed ramps - they are mismatched feed ramps. One is an M4 cut, the other is a rifle cut. Mixing them may cause feeding issues based on the way they are put together. Evidently the person who assembled the rifle didn't what he had.
Y'now lunar is right, looking closer at the original picture I thought the barrel extension's ramps were cut deeper but taking another look it's possible they could be M16/rifle style ramps which would cause big problems in a receiver with M4 cuts. If the bullet tip can catch on anything while you're testing manually you know things will go FUBAR when dumping a magazine. Hard to be 100% from that picture but it would be quite obvious if you inspected in hand or with better pictures.
You wouldn't expect Del-Ton to make this mistake but who knows who dicked with this "NIB" rifle afterwards. Glad you passed on this, g17frantz!
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek