Posted: 7/17/2020 9:05:50 PM EDT
[Last Edit: fastswift][Edited]
|
I have a 16 inch 9mm Banshee upper, using it with endo mags and factory ammo. As of this morning I have 500 rounds fired At least once a mag or more I will get a round chambered and have a misfire - as in the hammer falls and no mark on the primer. I have yet to be able to go 30 rounds without this happening. It is random - could be the first round or could be the 23ed round. Today (before I gave up) I had two in the first 10 rounds of the magazine. Today each time this happened I pushed the FA and made sure the bolt had been seated. Don't know about before I pulled the trigger, but the bolt was seated/in battery after the misfire. Rounds seem to feed and extract fine. Have not had any stoppages caused by FTF or FTE What I have tried: 3 separate lowers, all with carbine extensions and standard carbine buffers/springs. These three lowers have different triggers - AGL, LaRue and a stock CMMG out of a parts kit The BCG is well lubed, and I have cleaned the upper a couple of times. The lugs on the bolt look great with a slight polishing from the rounds fired. Firing pin seems to move easily. Fired cases have a nice big strike showing on the primer. The ammo is factory and includes 115, 124 and 147 grain bullets I have emailed customer service and waiting on a response. Just curious if anyone else has seen or heard of this happening and any possible cures. |
|
If anyone was curious, I was on the phone on the way home from the range today with CMMG tech support and they diagnosed a bent or otherwise out of spec firing pin. They are sending me two replacements Got home, pulled the BCG apart and sure enough the firing pin would bind (EDIT - a touch of break free loosened it right up. No binding) when spun in the bolt. Once I get the new FPs I will retest and hopefully close out this thread. |
|
Not sure if anyone is following this, but I received two new firing pins from CMMG, installed one and today I got 5 rounds into my range session and same thing happened. What sucks is I have a friend with exactly the same set up and his has run 100% since day one. Follow up email has been sent to manager at CMMG tech support. |
|
I've been waiting on my new Banshee for more than 10 weeks now. I've been lurking, watching your trials here and I'm getting a little concerned about my new purchase. It seems to me that CMMG hasn't monitored this forum for months. I'd be interested to see what the outcome here is, and how CMMG handles it customer service wise. |
|
Originally Posted By RF_lab_rat: I've been waiting on my new Banshee for more than 10 weeks now. I've been lurking, watching your trials here and I'm getting a little concerned about my new purchase. It seems to me that CMMG hasn't monitored this forum for months. I'd be interested to see what the outcome here is, and how CMMG handles it customer service wise. Couple of things: A buddy on the East coast has the exact same set up as I do and his has run 100% since day one. He has other friends with pistol versions that also have run 100% Customer service - One word - Excellent. They have been very open to diagnosing the problem and switching out parts. Return emails quickly and are very polite. What is going on now...I will be getting a brand new BCG in 4 days (if we can trust UPS) I sent them back the original plus the replacement parts I received so they can test the unit. Next range time is a week from Friday in the warm CA desert... 
|
|
Last post on this. Got the new BCG and took it out today. Flawless. All 7 of my mags ran 100% problem free. I used an assortment of ammo including my reloads and a few different shooters. Rang steel all day long in the hot CA desert. Closing this out with a big thumbs up to the guys at CMMG tech support. |
|
Given the BCG is the heart of the entire-semi auto action in the Banshee it's not very specific. Did you swap bolts or bolt carriers around before they sent you an entirely new BCG? |
Married the most eligible woman on ARFCOM. https://www.ar15.com/forums/t_1_5/2338223_Preban-mags-to-Massachusetts-thread-show-us-your-dirty-naughty-Orlites-.html
|
Originally Posted By backbencher: Given the BCG is the heart of the entire-semi auto action in the Banshee it's not very specific. Did you swap bolts or bolt carriers around before they sent you an entirely new BCG? This is what was tried: -remember Lite strikes were the issue - CMMG the sent me two new firing pins. I tried them both with no improvement. I also tried a Colt FP with same result. I had also tried a new firing pin spring I had bought as part of a spare parts kit. Same result. Spoke to Bryan at CMMG and over the course of a few emails decided to just trade out the entire BCG so they could run tests on it and see if they could duplicate the problem. Not sure if they were able to tie it down in the shop, but the new BCG fixed it on my end. |