Albroswift Posted July 20, 2019 Report Share Posted July 20, 2019 (edited) I'm seeing Sig Sauer barrels are on sale $49.99 to $89.99, Are these: 1.) Mill Spec in the AR15 platform? 2.) Decent quality/ accuracy? I see in another thread the 12.5" 308 barrel was Spec except for gas tube length, any experience with their Carbine and rifle length barrels? Very tempting for my current 223 carbine build, 16" non threaded barrel, maybe clamp in the mill and cut a 3 gill comp into the end, maybe just run as is. https://www.cdnnsports.com/sig-sauer-m400-16-5-56-1-7.html?___SID=U#.XTNP9utKiUk Edited July 20, 2019 by Albroswift Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted July 20, 2019 Report Share Posted July 20, 2019 I have a build with a 16 inch Sig M400 barrel ready to go together when I have time. They are standard AR15 spec. Fit and finish are very good, accuracy to be determined. Quote Link to comment Share on other sites More sharing options...
Albroswift Posted July 21, 2019 Author Report Share Posted July 21, 2019 Just pulled the trigger on two of them. zero tax, zero shipping $99.98 for the pair. Worst case I have some barrel grade lathe stock. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted July 21, 2019 Report Share Posted July 21, 2019 4 minutes ago, Albroswift said: Just pulled the trigger on two of them. zero tax, zero shipping $99.98 for the pair. Worst case I have some barrel grade lathe stock. Which ones did you get - 2 x .308 barrels? Quote Link to comment Share on other sites More sharing options...
Albroswift Posted July 21, 2019 Author Report Share Posted July 21, 2019 (edited) Two Sig M400 .223 16" non threaded. Last week 12.5" Sig Sauer (threaded) in .308 showed up, think it was $53.00 with shipping. Not sure how much fun a 308 pistol would be, thinking of maybe pinning a 3.5" flash can on it after sorting things out. Edited July 21, 2019 by Albroswift Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted July 21, 2019 Report Share Posted July 21, 2019 16 minutes ago, Albroswift said: Not sure how much fun a 308 pistol would be, thinking of maybe pinning a 3.5" flash can on it after sorting things out. Suppressor is the way to go, makes it a blast to shoot. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted July 21, 2019 Report Share Posted July 21, 2019 6 hours ago, Albroswift said: Two Sig M400 .223 16" non threaded. Last week 12.5" Sig Sauer (threaded) in .308 showed up, think it was $53.00 with shipping. Not sure how much fun a 308 pistol would be, thinking of maybe pinning a 3.5" flash can on it after sorting things out. I've got a 13.5" Armalite barrel and a 3-port brake pinned to it to get it a tick over 16", and it's actually (surprisingly) pleasant to shoot. Shocked me. Quote Link to comment Share on other sites More sharing options...
Albroswift Posted July 22, 2019 Author Report Share Posted July 22, 2019 I found a 4in and a 4.5 in comp looks similar to above 40-45 bucks. Think Ill use that for the build and switch to the can afterwards. May chuck it in the lathe and turn it down to a little under .750 before I pin it on. Or after? Quote Link to comment Share on other sites More sharing options...
Albroswift Posted July 22, 2019 Author Report Share Posted July 22, 2019 Sig 12.5 308 gas port looks like it's too far forward on the journal, shouldn't it be about a half inch off the stop? Nothing a hack with some machine tools like myself can't overcome. Quote Link to comment Share on other sites More sharing options...
Albroswift Posted July 22, 2019 Author Report Share Posted July 22, 2019 Sig 12.5 308 gas port looks like it's too far forward on the journal, shouldn't it be about a half inch off the stop? Nothing a hack with some machine tools like myself can't overcome. The 716 is apparently a piston system. Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted July 23, 2019 Report Share Posted July 23, 2019 1 hour ago, Albroswift said: Sig 12.5 308 gas port looks like it's too far forward on the journal, shouldn't it be about a half inch off the stop? Nothing a hack with some machine tools like myself can't overcome. The 716 is apparently a piston system. 716 is a piston gun. I used a SLR gas block dimple jig to get it positioned exactly. The block hangs a bit over the journal ledge but that hasn’t been an issue, could be with a different block though. Quote Link to comment Share on other sites More sharing options...
Albroswift Posted July 23, 2019 Author Report Share Posted July 23, 2019 Cool. Did you go with the hole size or open it up a little bit? Looks a lot smaller then my 18" barrel Quote Link to comment Share on other sites More sharing options...
98Z5V Posted July 23, 2019 Report Share Posted July 23, 2019 (edited) 1 hour ago, Albroswift said: Cool. Did you go with the hole size or open it up a little bit? Looks a lot smaller then my 18" barrel It's only a 12.5" barrel, and the gas system is right between midlength and carbine length -there's not alot of dwell time there. I'd have to go back to my 13.5" numbers and look at it, because it'll have near identical dwell time. Here it is: Armalite AR-10 barrel, 13.5" OAL, midlength gas system (Armalite AR-10 Carbine Gas System, exactly), gas port diameter 0.081". Edited July 23, 2019 by 98Z5V Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted July 23, 2019 Report Share Posted July 23, 2019 7 hours ago, Albroswift said: Cool. Did you go with the hole size or open it up a little bit? Looks a lot smaller then my 18" barrel I left it alone, no need to open it up as function has been flawless both normal and suppressed. I put the size in the beginning of the thread I posted above, .073". I was surprised it did not need opened up since my 716 has shown signs of being undergassed, must be in the piston portion. Quote Link to comment Share on other sites More sharing options...
Albroswift Posted July 23, 2019 Author Report Share Posted July 23, 2019 What gas block did you go with? Did you single dimple or was there room on the journal for 2? This is going to be one of those "The part was on sale so I built the whole gun around it" stories, nothing new on this forum! I'll keep everyone posted as I round up parts. Quote Link to comment Share on other sites More sharing options...
Albroswift Posted July 23, 2019 Author Report Share Posted July 23, 2019 Never mind, see your build in your other post. Thanks! Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted July 23, 2019 Report Share Posted July 23, 2019 4 hours ago, Albroswift said: Did you single dimple or was there room on the journal for 2? I honestly don't remember for sure, seems like it was right on the edge. I remember not cranking down to hard on the second screw. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted July 24, 2019 Report Share Posted July 24, 2019 Use a Geissele Super Gas Block, and pin it. No worries, then. That's my plan for it. Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted July 24, 2019 Report Share Posted July 24, 2019 8 hours ago, 98Z5V said: Use a Geissele Super Gas Block, and pin it. No worries, then. That's my plan for it. Agreed, that would be the best option. I went adjustable due to suppressor use but at some point I will experiment with it and see if I can't get by without the adjustable. I have the block turned down pretty good right now but with the smallish gas port it may just get by. Quote Link to comment Share on other sites More sharing options...
Albroswift Posted July 29, 2019 Author Report Share Posted July 29, 2019 I like the Geissele, but I'm thinking adjustable. I have the tech to pin any block if I need to. I mocked up the 12-1/16 tube in the upper assembly, 7/8" long, so need a 11-3/16 tube to hit dead center of the receiver cutout. Other option is to move the hole back, the gas block would block the original hole while it gummed up with carbon, or I could drill/ tap a set screw into it. Thinking the custom tube is the easiest option. Quote Link to comment Share on other sites More sharing options...
392heminut Posted July 29, 2019 Report Share Posted July 29, 2019 Well, you fukkers have done it again! I kept reading the posts about these barrels and I broke down and bought one! I have NO fukkin idea what I'm gonna do with it, pistol build or pinned muzzle device to make a legal carbine. Hell, I don't even have a receiver set!😣 Quote Link to comment Share on other sites More sharing options...
Rsquared Posted July 29, 2019 Report Share Posted July 29, 2019 49 minutes ago, 392heminut said: Well, you fukkers have done it again! I kept reading the posts about these barrels and I broke down and bought one! I have NO fukkin idea what I'm gonna do with it, pistol build or pinned muzzle device to make a legal carbine. Hell, I don't even have a receiver set!😣 Quote Link to comment Share on other sites More sharing options...
Albroswift Posted July 29, 2019 Author Report Share Posted July 29, 2019 (edited) 49 dollar barrel is better then starting with a roll pin... You are way ahead of the game. a 4" muzzle device will put you right at 16. I found a 4-1/2" steel, weighs about 10 lbs. Think I'm going to chuck it in the lathe and put it on a diet. Edited July 29, 2019 by Albroswift Quote Link to comment Share on other sites More sharing options...
392heminut Posted July 29, 2019 Report Share Posted July 29, 2019 (edited) 18 hours ago, Rsquared said: Yeah laugh fukker! The fact that you make it well known that you have a short barreled AR 308 didn't help matters! Edited July 29, 2019 by 392heminut Quote Link to comment Share on other sites More sharing options...
shooterrex Posted July 30, 2019 Report Share Posted July 30, 2019 Ok my barrel showed up got a question or two. Barrel extension has locating pin. Also another pin extending down by the locking lugs about 2 o'clock . Hole was drilled all the way through the barrel extension and pin inserted below the surface of the barrel extension on the outside but protruding in to the area of the locking lugs. I haven't seen this on any other barrels I have installed. WTF??? Quote Link to comment Share on other sites More sharing options...
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