CopperFouling
Member
I am having some issues with my rifle malfunctioning. I have some ideas about what could be causing the malfunctions but wanted to see what people here think are the highest-probability issues since I am much more knowledgeable about handguns and shotguns than I am about rifles.
Here's the context. I have a Daniel Defense DDM4V7. The bolt carrier group is coated in NP3+. I had 100 rounds of 55-grain 5.56 NATO through it (PMC, if I recall correctly). Those 100 rounds had no malfunctions.
Recently, I returned to the range to zero it with 77-grain 5.56 NATO made by IMI (same as listed here: https://www.midwayusa.com/product/2090124928). I bought that particular load because it is supposed to be highly accurate from a 1:7 twist barrel and it has a good BC. However, it is not cheap ammunition.
After roughly eight shots, the BCG cycled backward, but it failed to cycle all the way forward and go into battery. It was stuck well short of the chambered round. And the BCG was really, really stuck. I had to collapse the stock and tap the stock firmly on the ground to get the BCG to move rearward.
Figuring that I had perhaps had an out-of-spec round, I chambered another round and fired. The BCG cycled rearward again and failed to go into battery exactly like the previous malfunction. I cleared it in the same way.
I can think of a handful of possible causes:
1. Possible: The ammunition is out of spec.
2. Possible: The ammunition does not cycle well in my rifle.
3. Possible: The NP3+ coating on the BCG is causing the malfunctions.
4. Unlikely: The magazine is causing the malfunctions. I rate this as unlikely because the magazine is a barely used Magpul.
My first thought is to swap the ammunition first and see if I experience the malfunction again.
My second thought is to keep the ammunition the same and swap the BCG.
I figured, though, since I am not experienced with rifles like others on here, that I would see if anyone has ideas on the cause. Any troubleshooting advice is appreciated.
Here's the context. I have a Daniel Defense DDM4V7. The bolt carrier group is coated in NP3+. I had 100 rounds of 55-grain 5.56 NATO through it (PMC, if I recall correctly). Those 100 rounds had no malfunctions.
Recently, I returned to the range to zero it with 77-grain 5.56 NATO made by IMI (same as listed here: https://www.midwayusa.com/product/2090124928). I bought that particular load because it is supposed to be highly accurate from a 1:7 twist barrel and it has a good BC. However, it is not cheap ammunition.
After roughly eight shots, the BCG cycled backward, but it failed to cycle all the way forward and go into battery. It was stuck well short of the chambered round. And the BCG was really, really stuck. I had to collapse the stock and tap the stock firmly on the ground to get the BCG to move rearward.
Figuring that I had perhaps had an out-of-spec round, I chambered another round and fired. The BCG cycled rearward again and failed to go into battery exactly like the previous malfunction. I cleared it in the same way.
I can think of a handful of possible causes:
1. Possible: The ammunition is out of spec.
2. Possible: The ammunition does not cycle well in my rifle.
3. Possible: The NP3+ coating on the BCG is causing the malfunctions.
4. Unlikely: The magazine is causing the malfunctions. I rate this as unlikely because the magazine is a barely used Magpul.
My first thought is to swap the ammunition first and see if I experience the malfunction again.
My second thought is to keep the ammunition the same and swap the BCG.
I figured, though, since I am not experienced with rifles like others on here, that I would see if anyone has ideas on the cause. Any troubleshooting advice is appreciated.