Well I've been trying to sort out this grendel for some time now and I have just hit a wall. I have a Satern 20" rifle gas system barrel. See pics below to see what is happening. I've had the help of very good gunsmith to get this sorted but I don't know what to do next. the issue has improved after the changes we have done but still only functioning about 60-70%. here is what I have done.
1. Tried the upper out and it short stroked very bad would not lock back the bolt at all. i took it to my smith and he took it down to check and make sure the gas system was working. He showed me that all was lined up correctly and messured the port at .093. He went back to his notes on a couple of alexander Arms barrells than he knew functioned correctly. one was a 19.5" with a .105 gas port and a 24" with a .106 gas port. He did not want to open the port up without some other testing first. I got a now buffer spring and started cutting coils to see if it got better. I cut 1 at a time up to 6 coils and no change.
2. Went back with the bad news. My smith opened the barrel to .098. I purchased another buffer spring and took it back out. At first it was doing the same thing so I started cutting coils again. After 3 coils cut I was able to get 3 shots off without failure but failed again. I cut more but could still only get a max of 3 shots off before failure.
3. Went back again. My smith was very hesitant to open it up more so he gave it another look over and all looks good. He contacted one of his guys that has a factory Alexander Arms barrel and messured it at .105 as well. so we opened it up to that. I put the factory buffer spring back in and took it out. first 5 shots when perfect but started doing it again but not Nearly as much. I don't want to open this port up anymore as I have seen that most people are working just fine in the .09X range. I'm stumped and don't know what else to try.
Here are the pics.
1. Tried the upper out and it short stroked very bad would not lock back the bolt at all. i took it to my smith and he took it down to check and make sure the gas system was working. He showed me that all was lined up correctly and messured the port at .093. He went back to his notes on a couple of alexander Arms barrells than he knew functioned correctly. one was a 19.5" with a .105 gas port and a 24" with a .106 gas port. He did not want to open the port up without some other testing first. I got a now buffer spring and started cutting coils to see if it got better. I cut 1 at a time up to 6 coils and no change.
2. Went back with the bad news. My smith opened the barrel to .098. I purchased another buffer spring and took it back out. At first it was doing the same thing so I started cutting coils again. After 3 coils cut I was able to get 3 shots off without failure but failed again. I cut more but could still only get a max of 3 shots off before failure.
3. Went back again. My smith was very hesitant to open it up more so he gave it another look over and all looks good. He contacted one of his guys that has a factory Alexander Arms barrel and messured it at .105 as well. so we opened it up to that. I put the factory buffer spring back in and took it out. first 5 shots when perfect but started doing it again but not Nearly as much. I don't want to open this port up anymore as I have seen that most people are working just fine in the .09X range. I'm stumped and don't know what else to try.
Here are the pics.
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