sniper20
FNG
Hey guys, wondering if I might be able to get a little help here. I did a search and didn't find anyone with the problems I am having.
I currently have a 24" 6.5 Grendel in the AR-15 platform. I have run this rifle un-suppressed for years and haven't had issues with it. I decided to get a suppressor for my hunting and target shooting hobbies, and of course, this got it thrown on there too.
The suppressor is a Daniel Defense (KGM Tech) with a "flow through" design hybrid. I run this on my 5.56 AR's (with a thread adapter), 300BO (supers and subs) and my hunting rifles. I don't have an issue with any of them (the above mentioned have a standard gas block on them... I can tell it adds gas, but they don't malfunction and it's not much more gas).
However, the 6.5 Grendel started giving me fits. Again, it's a 24" barrel, Type 1 chamber and bolt, rifle length gas system, full auto bolt carrier, standard A2 buffer and buffer spring. It had a standard gas block, but I recently switched it out for an Aero Precision adjustable gas block. I use them on a few of my rifles and they work well. I adjusted the gas block so it would hold the bolt open on the last round, then added 3 more clicks (25 total adjustable clicks, this is right at 14 clicks with the added 3) for reliability, same as my other rifles.
The issue I'm having hasn't gone away... The brass will eject at the 4 o'clock position for 85% of the time. But every now and then, brass will shoot up to the 12-1 o'clock position (it's not an M1A... not sure why). But the jams I get are very strange. Some will just have the brass sitting on top of the next round, but half of the ones that don't eject will ejected in an upward movement... The grass head will stay on the bolt and the mouth will actually get caught on the charging handle. Those are a bear to clear and I have to get a tool to grab the BCG and pull it backwards. Obviously if I use the charging handle, it just pulls the brass backwards.
I checked the bolt to ensure the ejector and extractor were not the issue. These Type 1 chambers are supposedly known to have extractor problems. Both have proper spring pressure and grip the case as they should.
I'm at a loss as to what the issue would be. I had adjusted the gas block up and down, but the problem persists. I seem to get excessive soot build up in the magazine, more so than my other rifles.
The only thing I can think to look at now would be an extra weight buffer/buffer spring maybe? The ammunition are my reloads, which are not max/min charge and have worked perfect in the un-suppressed rifle. Any help would be appreciated.
I currently have a 24" 6.5 Grendel in the AR-15 platform. I have run this rifle un-suppressed for years and haven't had issues with it. I decided to get a suppressor for my hunting and target shooting hobbies, and of course, this got it thrown on there too.
The suppressor is a Daniel Defense (KGM Tech) with a "flow through" design hybrid. I run this on my 5.56 AR's (with a thread adapter), 300BO (supers and subs) and my hunting rifles. I don't have an issue with any of them (the above mentioned have a standard gas block on them... I can tell it adds gas, but they don't malfunction and it's not much more gas).
However, the 6.5 Grendel started giving me fits. Again, it's a 24" barrel, Type 1 chamber and bolt, rifle length gas system, full auto bolt carrier, standard A2 buffer and buffer spring. It had a standard gas block, but I recently switched it out for an Aero Precision adjustable gas block. I use them on a few of my rifles and they work well. I adjusted the gas block so it would hold the bolt open on the last round, then added 3 more clicks (25 total adjustable clicks, this is right at 14 clicks with the added 3) for reliability, same as my other rifles.
The issue I'm having hasn't gone away... The brass will eject at the 4 o'clock position for 85% of the time. But every now and then, brass will shoot up to the 12-1 o'clock position (it's not an M1A... not sure why). But the jams I get are very strange. Some will just have the brass sitting on top of the next round, but half of the ones that don't eject will ejected in an upward movement... The grass head will stay on the bolt and the mouth will actually get caught on the charging handle. Those are a bear to clear and I have to get a tool to grab the BCG and pull it backwards. Obviously if I use the charging handle, it just pulls the brass backwards.
I checked the bolt to ensure the ejector and extractor were not the issue. These Type 1 chambers are supposedly known to have extractor problems. Both have proper spring pressure and grip the case as they should.
I'm at a loss as to what the issue would be. I had adjusted the gas block up and down, but the problem persists. I seem to get excessive soot build up in the magazine, more so than my other rifles.
The only thing I can think to look at now would be an extra weight buffer/buffer spring maybe? The ammunition are my reloads, which are not max/min charge and have worked perfect in the un-suppressed rifle. Any help would be appreciated.
