Clint Oris
Member
I could use some help.
I have a 10.5" barrel .300blk, and I am short stroking whether I run supers or subs, suppressed or un-suppressed. This is a build. It has never cycled. I have less than 30 rounds through it. My suppressor is an OSS Helix 762 QD - so there is no back pressure from the can.
I have an Adam's Arms pistol length piston kit, with an adjustable gas block. I have Adam's Arms light weight BCG with their bolt. I an running a JP Enterprises silent captured buffer with the H2 counterweights. Here is what I have done to try to resolve this:
I have an identical build, except it has an 18" barrel, .223W, and is running a rifle length piston. It also has just the standard JP silent captured buffer.. the only difference is lighter counterweights and I believe the spring is lighter, but mine is a first run on gen 2 and they didn't color the spring to differentiate .
That gun runs like a dream. I swapped buffers to see if the weight had anything to do with it. It did not resolve the issue.
Then I purchased the alternate spring kit from JP and swapped the spring for their lightest offering of 80lbs. The other gun is running an 85lb spring. That didn't resolve it.
Then I swapped out the piston return spring which has a 9lb compressed weight for a lighter spring that is about 3lbs. No change.
In the process of changing the piston spring, the fouling around the gas port indicated that I was dead center on the port with the gas block, so I know it wasn't an alignment issue. The OE port was .0935". I bored it out with a 7/64" bit to .1094". That did not resolve.
On both guns, I have a Hiperfire Hipertouch Elite trigger, but the .223W felt like it had a lighter hammer spring, and the spring wire looked thinner. I called Hipertouch and they told me that they did lighten the hammer spring between the 2 versions (one is 2 years older than the other) and they were kind enough to mail me their current spring, which is a 4.5lb compression weight. I put a caliper on the springs to compare and the new spring was indeed .002" thinner on the wire. That has improved things to the point where I'm at least ejecting the spent casing now, where as before it was not opening enough to even stove pipe. The spent shell was being reloaded into the bore.
At this point, I'm not sure what else I can do. I don't know if my BCG is too light and doesn't have the inertia to compress the buffer all the way, or what's going on. I just don't have enough experience in this arena to know what's going on. I would greatly appreciate some feedback.
I have a 10.5" barrel .300blk, and I am short stroking whether I run supers or subs, suppressed or un-suppressed. This is a build. It has never cycled. I have less than 30 rounds through it. My suppressor is an OSS Helix 762 QD - so there is no back pressure from the can.
I have an Adam's Arms pistol length piston kit, with an adjustable gas block. I have Adam's Arms light weight BCG with their bolt. I an running a JP Enterprises silent captured buffer with the H2 counterweights. Here is what I have done to try to resolve this:
I have an identical build, except it has an 18" barrel, .223W, and is running a rifle length piston. It also has just the standard JP silent captured buffer.. the only difference is lighter counterweights and I believe the spring is lighter, but mine is a first run on gen 2 and they didn't color the spring to differentiate .
That gun runs like a dream. I swapped buffers to see if the weight had anything to do with it. It did not resolve the issue.
Then I purchased the alternate spring kit from JP and swapped the spring for their lightest offering of 80lbs. The other gun is running an 85lb spring. That didn't resolve it.
Then I swapped out the piston return spring which has a 9lb compressed weight for a lighter spring that is about 3lbs. No change.
In the process of changing the piston spring, the fouling around the gas port indicated that I was dead center on the port with the gas block, so I know it wasn't an alignment issue. The OE port was .0935". I bored it out with a 7/64" bit to .1094". That did not resolve.
On both guns, I have a Hiperfire Hipertouch Elite trigger, but the .223W felt like it had a lighter hammer spring, and the spring wire looked thinner. I called Hipertouch and they told me that they did lighten the hammer spring between the 2 versions (one is 2 years older than the other) and they were kind enough to mail me their current spring, which is a 4.5lb compression weight. I put a caliper on the springs to compare and the new spring was indeed .002" thinner on the wire. That has improved things to the point where I'm at least ejecting the spent casing now, where as before it was not opening enough to even stove pipe. The spent shell was being reloaded into the bore.
At this point, I'm not sure what else I can do. I don't know if my BCG is too light and doesn't have the inertia to compress the buffer all the way, or what's going on. I just don't have enough experience in this arena to know what's going on. I would greatly appreciate some feedback.