KneverKnew
Bearcat
Has anyone fixed any function issues with their SFAR by simply swapping the Ruger 3 position GB for a different adjustable GB?
Try replacing the 3 oz ar 15 buffer with a 5.5 H3 AR 15 buffer. A standard AR 10 buffer is 3.8-4 oz. I have no idea why Ruger would use a 3 oz 5.56 buffer. And the bolt carrier is a lot lighter than a standard AR 10 BCG! And as for the GB? I took mine off and put a fixed one because for me? I'm never going to use a suppressor on mine. Mine was having bs issues about 150 rounds in. And it wasn't consistent. When I found a 3 ounce buffer in a .308 I thought WTF?? I think once the spring starts to set that they are using the trouble begins. System is moving too fast.Has anyone fixed any function issues with their SFAR by simply swapping the Ruger 3 position GB for a different adjustable GB?
I do have a suppressor to use so adjustable gas block is needed. If the H3 buffer, or possibly a stronger flat or braided spring doesn't help the over gassing issue with ruger's gas block I will try one of my Odin Works adjustables. I think that will do the trick. But I'd like to try and leave original if possible.Try replacing the 3 oz ar 15 buffer with a 5.5 H3 AR 15 buffer. A standard AR 10 buffer is 3.8-4 oz. I have no idea why Ruger would use a 3 oz 5.56 buffer. And the bolt carrier is a lot lighter than a standard AR 10 BCG! And as for the GB? I took mine off and put a fixed one because for me? I'm never going to use a suppressor on mine.
I am convinced the lighter bolt and the light 3 oz AR 15 buffer is the main issue. The gas PRESSURE on a .308 has to be higher than what it would be on a 5.56. What I see happening is a timing issue caused by the bolt travelling so fast that the rounds don't have enough time to come up in front of the bolt. And it starts happening after the spring that is supplied starts to set a bit. I think the H3 buffer will solve the issue for you. And if you run a suppressor, don't you cut off the gas? Or do you use #1 position? I'm ignorant on the suppressor question. And why would you want to use one on a .308 in the first place? Just curious...I do have a suppressor to use so adjustable gas block is needed. If the H3 buffer, or possibly a stronger flat or braided spring doesn't help the over gassing issue with ruger's gas block I will try one of my Odin Works adjustables. I think that will do the trick. But I'd like to try and leave original if possible.
I think I'd want some data to back this up given they are the same MAP (62ksi) and the case volumes and barrel cross-sectional areas are pretty well 2:1 matched. As a first guess, I'd say the port pressures should be just about the same.The gas PRESSURE on a .308 has to be higher than what it would be on a 5.56.
I agree with you. It's a matter of overgassing causing to fast timing. Had similar issues with my 458 Socom. I'm sure the H3 should help. I'm thinking adding a flat wound spring might be necessary too but testing will tell.I am convinced the lighter bolt and the light 3 oz AR 15 buffer is the main issue. The gas PRESSURE on a .308 has to be higher than what it would be on a 5.56. What I see happening is a timing issue caused by the bolt travelling so fast that the rounds don't have enough time to come up in front of the bolt. And it starts happening after the spring that is supplied starts to set a bit. I think the H3 buffer will solve the issue for you. And if you run a suppressor, don't you cut off the gas? Or do you use #1 position? I'm ignorant on the suppressor question. And why would you want to use one on a .308 in the first place? Just curious...
Will one of those piston systems fit the SFAR?The problem with '3 position' gas blocks is that it's quite possible that NONE of the 3 positions is correct for a specific need. This is where a thread adjustable gas block works better.
Most of my suppressor hosts have Adams Arms pistons installed and I've not had any problems with the OFF, Suppressor(let's call it half ON), or fully ON.