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Originally Posted By airgunner: @waddlingweezol The gas port on mine is .057" but it will only run suppressed. Unsuppressed it will not cycle (even with a standard 3oz buffer) which Sionics fully warns about with this barrel. If I had to guess, if you want to run suppressed and unsuppressed you would probably need to be in the low .060's range (like ~.063 maybe)? View Quote View All Quotes View All Quotes Originally Posted By airgunner: Originally Posted By waddlingweezol: Did you ever get a measurement on the gas port size? I saw you said smaller than 0.060, but wanted to see if you knew the exact size. I have a 12.5 ERGP barrel waiting to be built up, but my smallest pin gauge was 0.073 which obviously was too small. I'll probably make this one a dedicated suppressed set up with my DA Sierra 5 since that can was crazy gassy. I wonder what the gas port size is on the 12.5 standard gas port barrel. The gas port on mine is .057" but it will only run suppressed. Unsuppressed it will not cycle (even with a standard 3oz buffer) which Sionics fully warns about with this barrel. If I had to guess, if you want to run suppressed and unsuppressed you would probably need to be in the low .060's range (like ~.063 maybe)? I'm running a .0615 gas port equivalent BRT tube on my 12.5" Geissele barrel. The whole upper is Geissele and it's got a Super 42 w/H2 buffer. It runs great suppressed (a touch gassy, Turbo K), and still runs unsuppressed with my 5.56 reloads (tested down to low 30's for temps). ETA: I did not have to reduce buffer weight when testing unsuppressed as I mentioned probably having to do earlier in this thread. |
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Originally Posted By Freedom_Lover: Do you have any pictures of this? I'm considering the same thing and am interested in seeing how the m203 step works out with the 12.5 muzzle. Thanks View Quote View All Quotes View All Quotes Originally Posted By Freedom_Lover: Originally Posted By acrocat: I love my 12.5. I have a Colt M4A1 upper cut down to 12.5". Do you have any pictures of this? I'm considering the same thing and am interested in seeing how the m203 step works out with the 12.5 muzzle. Thanks Just because I am currently researching/considering the same at the moment: Attached File Attached File |
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Can't never could 'til try came along.
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Thank you. What's the lower barrel? It doesn't seem to have the same step cut.
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Can't never could 'til try came along.
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Originally Posted By Freedom_Lover: @acrocat Do you have any pictures of this? I'm considering the same thing and am interested in seeing how the m203 step works out with the 12.5 muzzle. Thanks View Quote I can post a picture if needed but the top picture that @TGWLDR posted is pretty much how the step looks. It should work great with a 9" M203 if that is what you are thinking. People have posted pictures of 9" M203 classic receivers with 12.5" barrels here before so it definitely works. FWIW, I went with a .068 gas port and my barrel is a Colt Socom profile barrel. |
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Start wearing eye protection, which you should be doing anyway with a suppressor, and you won't even notice the gas. Once you're not worried about the gas, build whatever you want.
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Originally Posted By Vapor_Man: Start wearing eye protection, which you should be doing anyway with a suppressor, and you won't even notice the gas. Once you're not worried about the gas, build whatever you want. View Quote LOL - sorry but that's not how that works. Have you ever shot a suppressed gun? I have a hard time believing you have based on that comment |
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On going to war over religion: "You're basically killing each other to see who's got the better imaginary friend." - Richard Jeni
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How about a PWS 11.85" piston upper in .223 Wylde? A substantial improvement to the GTF concern. They're pretty smooth.
Keith |
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Originally Posted By airgunner: @waddlingweezol The gas port on mine is .057" but it will only run suppressed. Unsuppressed it will not cycle (even with a standard 3oz buffer) which Sionics fully warns about with this barrel. If I had to guess, if you want to run suppressed and unsuppressed you would probably need to be in the low .060's range (like ~.063 maybe)? @Joedirt199 - Do you only run suppressed? Based on my experience with mine, I can't see yours running unsupressed regardless of buffer? View Quote View All Quotes View All Quotes Originally Posted By airgunner: Originally Posted By waddlingweezol: Did you ever get a measurement on the gas port size? I saw you said smaller than 0.060, but wanted to see if you knew the exact size. I have a 12.5 ERGP barrel waiting to be built up, but my smallest pin gauge was 0.073 which obviously was too small. I'll probably make this one a dedicated suppressed set up with my DA Sierra 5 since that can was crazy gassy. I wonder what the gas port size is on the 12.5 standard gas port barrel. The gas port on mine is .057" but it will only run suppressed. Unsuppressed it will not cycle (even with a standard 3oz buffer) which Sionics fully warns about with this barrel. If I had to guess, if you want to run suppressed and unsuppressed you would probably need to be in the low .060's range (like ~.063 maybe)? Originally Posted By Joedirt199: I cut down a 14.5" midlength gas BCM barrel to 12.5" and run a Turbo3 direct mounted. I also choke down the gas by using vented set screws in all my gasblocks and front sight bases. The vented set screws come with a .049 vent hole but this one is opened to .055. I then tune the buffer and spring for lock back. Some have H buffers and some have buffers with an aluminum weight replaced for a steel weight. They shoot smooth and have next to no gas in your face. Sionics wouldn't tell me their ERGP size. Triarc Systems Suppressed only barrels are .052" - .055" from what I've seen. Sionics looks close. I also see they have a suppressed only option on their product page. The ERGP option as .057" looks good. |
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Those who would give up essential liberty, to obtain a little temporary safety, deserve neither liberty nor safety
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Originally Posted By steviesterno16: @airgunner let me know if you find a decently cheap/light 12.5" barrel. I want to try this adventure too but currently saving for NV. View Quote Faxon makes 12.5" barrels that are probably the lightest AND some of the cheapest. You can get them on Optics Planet for a low price. |
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Proud millennial.
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Originally Posted By DefenderAO: Sionics wouldn't tell me their ERGP size. Triarc Systems Suppressed only barrels are .052" - .055" from what I've seen. Sionics looks close. I also see they have a suppressed only option on their product page. The ERGP option as .057" looks good. View Quote My 11.5 ERGP with an A5H2 and the Polonium K (not a low backpressure can) is probably my softest shooting AR. |
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responding to a thread, with the same comment that I already did last year
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I run a Turbo K on an 11.5, very minimum gas. I run an LMT E Carrier, FA gas vent, Armageddon CH, and a riflespeed adj gas block. I say go 12.5, AR's are easy to tune.
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