After my last range trip I saw this in my DDM4 while cleaning.
I should mention that I only have around 700 rounds through this gun (wish I had the time and $ to shoot more). Is this something that I should be concerned with enough to contact DD about it?
I would contact dd if that was mine. A crack can’t be good.
Yes, you need to contact DD about it asap.
i agree with the rest of the posts. I’ a big fan of DD and i know this isnt their norm but this is something that they need to fix. If your experience is anything similar to mine, you’ll be a happy shooter again in no time. (i didnt have a flawed product. Midway sent me a standard barrel instead of the CHF barrel i ordered and instead of contacting Midway I contacted DD and they sent the new barrel out the same day they received my barrel.)
Definitely contact DD. It doesn’t look significant, but the possibility exists that the crack has migrated on a microscopic level and it could be a larger indicator of a material defect with a certain batch. This is something DD would definitely want to know about.
Looking at it a little more closely, it looks like it’s chipped instead of cracked. When you run your finger over it, is it smooth or is there a noticeable indentation?
I would be less worried about a chip than I am about a crack. Chips can be blended out.
Based upon the photo only I would say that it is a chip or gouge and not a crack. I may be wrong. Any idea how it happened? Screwdriver -maybe to unstick something? Or just out of the blue?
If you are unsure I would probably contact DD and at least allow them to inspect it.
just happened out of the blue. wasnt there before i went to the range, was there when I came back (only shot 100 rounds that day too). It may be more of a chip, but since my gun is pretty young I dont see how it would get better over time. I’ll probably send these pics to DD.
I would be very curious of what caused it.
That’s an unusual location for a crack that small, considering it’s angle and the starting & termination point. I agree with Justin & IG that it looks more like a cut or gouge. I believe it’s from something that was caught in there
defiantly looks like a like a chip/gouge to me when i zoomed it in. I just cant figure out how the hell it happened, defiantly call or email them. Keep us updated on what they say.
Definitely strange get it looked and or see what DD says.
I have had great customer service from DD. Keep us updated on what they say is wrong.
Is it me, or does that brown stuff to the left of the chip look like pitting and corosion?
aluminum doesn’t corrode brown… it’s more of a hard gray oxide. basically forms its own coating. that’s one of the cool things about aluminum.
looks like a gouge to me… poke around a bit with something pointy and see if you can figure out how deep it is.
I’ll email DD tomorrow and send them the pics. I’ll keep yall posted.
Nah its not corrosion. Just whats left over from that super clean burning russian ammo 
Sent the pics to DD today. They are sending me an RMA number and instructions for sending in for repair. 
Glad they are going to fix it, but I’ll miss having my AR for a few weeks.
It won’t be too long…
I had to send one item back to DD and they had it back to me within about two weeks. I was very impressed with the rapid turnaround time…
I wouldn’t give that little thing a second thought.