OK guys, a trade came my way I want to really go for but need some help. It's a NIB DPMS lower with a DelTon upper. I'm extremely new in the AR market so i need some help. The pic he sent me of the feed ramp looks like an M4 and not the standard issue. The indentions of the ramp don't seem like they match with the cuts of the receiver, will this cause a feeding problem or anything? I might be talking out of my A$$ here not using the right terminology but I'm doing my best. Need help fast, Guy wants to trade tomorrow. What's a nib dpms with a DelTon upper worth? He's asking $700 for it with two mags and hard case. Thanks.