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JT661944's Review of CMMG 5.7X28mm 8in Banshee Upper Group Receiver
This is in no way a reflection on Optics Planet. They were great as always, but I've had CMMG projects in the past and never had an issue. Actually, I've never had this issue on any AR format rifle/pistol - EVER!
Mated this new upper to a brand new lower with Geissele parts except for the stripped receiver which was Aero Precision. Took it to the range to zero the optic and the first two shots were fine. On the third shot, the spent casing was stuck in the bolt face causing a double feed. Cleared it and kept going, but could only get one maybe two shots before it would do the same. Eventually it got to the point where it was happening with every round. I was able to zero it and it worked great with both Speer 40 gr & Range Dynamics 62gr. The 62 gr was about what I remember 300blk subs sounding like. While I'm excited about the potential of this, the real disappointment came when I got home to strip and clean the pistol. I found that the ejector was stuck inside the bolt flush with the bolt face, which explains the ejection issue. Disappointing for sure, but no biggie. I took photos of everything and submitted a ticket with CMMG. Listed every part used in the lower, type of ammo, thorough explanation of what was happening and numerous photos showing different examples of stove pipes, double feeds, all with a case still stuck in the bolt face. That included pics of the bolt showing the ejector frozen in the recessed position.
Apparently those weren't enough and I had to send more photos. Finally they agreed to send me an RMA, but stated that the wait time could be a month from receipt. This is where my dissatisfaction comes in. It's totally reasonable to have a bad part on a new rifle, but no manufacturer that I've ever had to send a return to for an obvious production/quality issue has forced me to wait until someone looks at it. The decent thing to do would be to ship out a replacement bolt once received and investigate what happened on their time. Especially since I've now found out that they have a history with bad ejectors / ejector springs on their bolts.
We'll see how this plays out as they're due to receive the return on Monday, but so far their customer service is not what it was made out to be. Aside from the quality issue on the bolt and poor service, I was extremely impressed by everything else. Good accuracy in 5.7 with both ammo types and everything else on the upper worked as expected and felt solid.
An issue like this should not still be happening years after discovery. Fix the problem or stop producing the design.
Mated this new upper to a brand new lower with Geissele parts except for the stripped receiver which was Aero Precision. Took it to the range to zero the optic and the first two shots were fine. On the third shot, the spent casing was stuck in the bolt face causing a double feed. Cleared it and kept going, but could only get one maybe two shots before it would do the same. Eventually it got to the point where it was happening with every round. I was able to zero it and it worked great with both Speer 40 gr & Range Dynamics 62gr. The 62 gr was about what I remember 300blk subs sounding like. While I'm excited about the potential of this, the real disappointment came when I got home to strip and clean the pistol. I found that the ejector was stuck inside the bolt flush with the bolt face, which explains the ejection issue. Disappointing for sure, but no biggie. I took photos of everything and submitted a ticket with CMMG. Listed every part used in the lower, type of ammo, thorough explanation of what was happening and numerous photos showing different examples of stove pipes, double feeds, all with a case still stuck in the bolt face. That included pics of the bolt showing the ejector frozen in the recessed position.
Apparently those weren't enough and I had to send more photos. Finally they agreed to send me an RMA, but stated that the wait time could be a month from receipt. This is where my dissatisfaction comes in. It's totally reasonable to have a bad part on a new rifle, but no manufacturer that I've ever had to send a return to for an obvious production/quality issue has forced me to wait until someone looks at it. The decent thing to do would be to ship out a replacement bolt once received and investigate what happened on their time. Especially since I've now found out that they have a history with bad ejectors / ejector springs on their bolts.
We'll see how this plays out as they're due to receive the return on Monday, but so far their customer service is not what it was made out to be. Aside from the quality issue on the bolt and poor service, I was extremely impressed by everything else. Good accuracy in 5.7 with both ammo types and everything else on the upper worked as expected and felt solid.
An issue like this should not still be happening years after discovery. Fix the problem or stop producing the design.
Pros:
- None
Cons:
- Bolt extractor broke in 4 shots
- Customer Servic
Would Recommend:
No