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Posted: 5/1/2022 7:45:22 PM EDT
[Last Edit: GoatBoy]
First Caveat - I am not a photographer. I was out cleaning guns this a.m. after a visit yesterday (and poor weather).
The Light looked good, so I took a few pictures of a unfinished Mod2 barrel, that I have up in NoVA to explain the Mod2 gas system to customers. Whole Assembly 
Assembly Disassembled: 
AN Fitting Straight Gas Tube: 
What this does is give a leak proof seal on the gas tube to gas block. With the convention gas tube setup one needs to either seal the block to tube with 1) Heat Resistant Compound - like Rockset) 2) Significantly high tolerances on the block and tube 3) a combo of that or 4) Port the gun larger than really needed to ensure sufficient gas to cycle the action. If your over port the gun, your going to do two things, have even more gas port erosion and higher bolt carrier velocity when it erodes, as well as the block and tube will eventually seal and you run into even higher carrier velocity -- which beats the gun to death sooner than needed. View of Gas Block Nozzle and Flared End on Gas Tube: 
Barrel Notch and Gas Block Self Aligning Prow 
To ensure all block will fit with all barrels - the gas block will self align on the barrel due to the shape of the notch -- with the taper pin system, a new block could not always be guaranteed to be bale to be mated properly with the old barrel which already had been drilled for taper pins on another gas block Another Look 
Thread on Gas Block Retaining System: 
Taper Pins, the bane of Engineers everywhere... The problem with taper pins, is that depending on how they are installed or re-installed, they can cause accuracy issues (as well as be scrapped or scrap out a gas block) you drive a metal pin into a metal barrel, and need to have enough tension so the pin is retained... Metal is moving someplace - and pressures on the barrel are not generally good. There are a few more benefits to this setup -- but here at least is a teaser for those who will be getting their Mod2 SR-15's shortly. |
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NV, USA
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Posted: 4/1/2014 4:03:00 PM EDT
[#1]
Thanks Kevin!
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HI, USA
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Posted: 4/1/2014 4:27:29 PM EDT
[#2]
Beautiful
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Posted: 4/1/2014 5:18:38 PM EDT
[#3]
neat
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Posted: 4/1/2014 7:29:35 PM EDT
[#4]
Wow, I wish I could retrofit a barrel with this system.
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Posted: 4/1/2014 8:36:30 PM EDT
[Last Edit: Spent_Casing]
[#5]
When I first heard of this I thought "Improved"= straight tube with threaded block? Whoopty fuckin do!
Gotta admit this is pretty trick. KAC ingenuity Ive come to expect. At the surface it appears similar to anyone who has ever replaced their own brake lines but I can understand the theory behind it.Thanks Kevin for the clarification.  ETA: and yeah, what osha said too^^ |
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NC, USA
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Posted: 4/1/2014 9:19:51 PM EDT
[#6]
That is slick as hell. Will a similar system be employed on the 7.62 guns?
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Posted: 4/1/2014 9:28:38 PM EDT
[#7]
Yet another reason why I love KAC, they keep pushing the envelope of the AR design and do not buy into the mantra "If it aint broke, don't fix it" theory..
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Posted: 4/2/2014 1:13:59 AM EDT
[#8]
Very cool.
I was wondering how you guys had solved the potential gasblock rotation issue. Glad to see my theory was correct! And taper pins aren't the only bane of engineers. They're problematic, sure, but not nearly as bad as other things. |
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Posted: 4/2/2014 7:09:11 AM EDT
[#9]
I like it a lot.
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Posted: 4/2/2014 10:22:55 AM EDT
[#10]
Mod2 Gas is on all KAC/KMC systems now:
762 556 300BK 030 will tell you I was a serious naysayer on this and the URX4 - but I will say I have come around completely. |
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Posted: 4/2/2014 10:43:50 AM EDT
[#11]
I really like this. I see that PWS is doing something similar as well. Can you quantify roughly the difference in price from this system to the legacy system and the reduction in gas port diameter? Understood if that is proprietary.
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Posted: 4/2/2014 1:18:35 PM EDT
[#12]
We already ran relatively small sized ports.
I don't believe there was a price change on the retail side. While many of the parts cost us more, we think it was well worth it. |
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USA
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Posted: 4/2/2014 2:19:24 PM EDT
[#13]
Not that would actually matter to me, but what is the weight difference of all parts compared to the weight of your more traditional lo pro gas block/tub/pins? This is very interesting to me though and thank you for the pics.
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Posted: 4/2/2014 3:07:56 PM EDT
[#14]
Pricing remains the same as the Mod 1.
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Posted: 4/2/2014 3:11:54 PM EDT
[#15]
Very cool
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Posted: 4/2/2014 3:21:46 PM EDT
[#16]
This system is another good reason for KAC to start releasing barrels for sale
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Posted: 4/2/2014 3:31:48 PM EDT
[#17]
Kevin,
Where is the gas port on the barrel? I would expect it to be in-line with the notch that locates the gas block (this would also put it directly underneath the gas tube), but that's not shown in the pictures. This is a much more robust solution than the mil-spec taper-pins. It's nothing hi-tech, mind you, just good engineering judgement borrowing existing technologies and is one of those things that seems obvious now. |
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Posted: 4/2/2014 3:50:17 PM EDT
[#18]
So the Mod 2 still weighs as much as the Mod 1 though?
That's the case according to the site. |
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Posted: 4/2/2014 4:00:53 PM EDT
[#19]
Remember what I mentioned about a sample scrap barrel.
Barrel does not have port, chamber, or chrome --> I think to ensure I don't mount it and shoot it ;) I've even bought a SR-15E3 Mod2 16" Carbine... Yes I'm still waiting and bitching to Tom daily... 
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Posted: 4/2/2014 6:30:56 PM EDT
[#20]
Quote HistoryOriginally Posted By KevinB:
Remember what I mentioned about a sample scrap barrel. Barrel does not have port, chamber, or chrome --> I think to ensure I don't mount it and shoot it ;) I've even bought a SR-15E3 Mod2 16" Carbine... Yes I'm still waiting and bitching to Tom daily... Yeah, I kinda got excite about the pictures and didn't read that part. U should tell HQ that your .gov customers want a functioning rifle to evaluate ... Which, of course, you would have to keep on hand for demo purposes ...:). I'm guessing you already tried that though. Posted Via AR15.Com Mobile |
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Posted: 4/3/2014 2:48:30 AM EDT
[#21]
I'm pretty sure he's got a few demonstrators.
I think what he means is that he's waiting on a personal gun.
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Posted: 4/3/2014 8:30:49 AM EDT
[#22]
Quote HistoryOriginally Posted By Krazny13:
I'm pretty sure he's got a few demonstrators. I think what he means is that he's waiting on a personal gun. 110% correct sir. |
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TX, USA
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Posted: 4/4/2014 12:47:50 PM EDT
[#23]
Looks awesome, now I just have to decide between a NT4 or a mod 2 SBR.
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Posted: 4/4/2014 4:42:30 PM EDT
[#24]
Quote HistoryOriginally Posted By KevinB:
110% correct sir. Quote HistoryOriginally Posted By KevinB:
Originally Posted By Krazny13:
I'm pretty sure he's got a few demonstrators. I think what he means is that he's waiting on a personal gun. 110% correct sir. You could just write 'KevinB' on a demonstrator with a paint pen, maybe lick it and call it yours? |
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Posted: 4/4/2014 4:42:51 PM EDT
[Last Edit: Krazny13]
[#25]
Quote HistoryOriginally Posted By KevinB:
110% correct sir. Quote HistoryOriginally Posted By KevinB:
Originally Posted By Krazny13:
I'm pretty sure he's got a few demonstrators. I think what he means is that he's waiting on a personal gun. 110% correct sir. Reply button is on burst today, it seems. . . . 
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AL, USA
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Posted: 4/4/2014 4:45:54 PM EDT
[#26]
Very impressive. KAC is truly at the top of the game right now.
Everyone knows a real man's rifle has threads to lock the gas manifold on the barrel (M14, Garand). 
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Posted: 4/4/2014 5:10:54 PM EDT
[#27]
Quote HistoryOriginally Posted By KevinB:
Mod2 Gas is on all KAC/KMC systems now: 762 556 300BK 030 will tell you I was a serious naysayer on this and the URX4 - but I will say I have come around completely. Do those 762 guns include the most recent shipments of ECCs, or is it just for the new APC and other future 762 models? |
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Posted: 4/4/2014 5:38:42 PM EDT
[#28]
Quote HistoryOriginally Posted By osha:
Do those 762 guns include the most recent shipments of ECCs, or is it just for the new APC and other future 762 models? Quote HistoryOriginally Posted By osha:
Originally Posted By KevinB:
Mod2 Gas is on all KAC/KMC systems now: 762 556 300BK 030 will tell you I was a serious naysayer on this and the URX4 - but I will say I have come around completely. Do those 762 guns include the most recent shipments of ECCs, or is it just for the new APC and other future 762 models? The ECC's have the legacy gas system. |
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Posted: 4/5/2014 7:07:54 PM EDT
[#29]
Quote HistoryOriginally Posted By osha:
Do those 762 guns include the most recent shipments of ECCs, or is it just for the new APC and other future 762 models? Quote HistoryOriginally Posted By osha:
Originally Posted By KevinB:
Mod2 Gas is on all KAC/KMC systems now: 762 556 300BK 030 will tell you I was a serious naysayer on this and the URX4 - but I will say I have come around completely. Do those 762 guns include the most recent shipments of ECCs, or is it just for the new APC and other future 762 models? Just the new E2 line. Legacy guns will still come with the same features as before. |
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Posted: 4/5/2014 10:23:00 PM EDT
[#30]
Quote HistoryOriginally Posted By SxPxDx:
Just the new E2 line. Legacy guns will still come with the same features as before. Quote HistoryOriginally Posted By SxPxDx:
Originally Posted By osha:
Originally Posted By KevinB:
Mod2 Gas is on all KAC/KMC systems now: 762 556 300BK 030 will tell you I was a serious naysayer on this and the URX4 - but I will say I have come around completely. Do those 762 guns include the most recent shipments of ECCs, or is it just for the new APC and other future 762 models? Just the new E2 line. Legacy guns will still come with the same features as before. I'd volunteer to beta test a mod 2 gas system on my ECC. Had to send it back for a barrel issue anyway. ;) Posted Via AR15.Com Mobile |
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Posted: 4/7/2014 8:49:48 AM EDT
[#31]
Won't work with that barrel.
You know you could have gotten an APC instead of the ECC. |
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Posted: 4/7/2014 11:27:31 AM EDT
[Last Edit: LHJ3]
[#32]
Quote HistoryOriginally Posted By KevinB:
Won't work with that barrel. You know you could have gotten an APC instead of the ECC. But dimples!
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Posted: 4/7/2014 8:10:58 PM EDT
[Last Edit: LHJ3]
[#33]
Quote HistoryYou know you could have gotten an APC instead of the ECC. But dimples!
APC barrel feels lighter to me, but hey, who am I?
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USA
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Posted: 4/7/2014 10:19:15 PM EDT
[Last Edit: GSAKnight]
[#34]
In a year or two.
Quote HistoryOriginally Posted By KevinB:
Won't work with that barrel. You know you could have gotten an APC instead of the ECC. |
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Posted: 4/8/2014 12:03:43 AM EDT
[#35]
Quote HistoryOriginally Posted By LHJ3:
APC barrel feels lighter to me, but hey, who am I? Quote HistoryOriginally Posted By LHJ3:
You know you could have gotten an APC instead of the ECC. But dimples!
APC barrel feels lighter to me, but hey, who am I? Its an enginerd thing. I could try to explain it, but I don't think I'd get the point across. If you guys want to send me back an APC or ACC barrel or upper instead of the ECC one, I wouldn't mind.
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Posted: 4/8/2014 8:33:16 AM EDT
[#36]
Quote HistoryOriginally Posted By LHJ3:
APC barrel feels lighter to me, but hey, who am I? Clearly someone who cannot read a scale
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Posted: 4/10/2014 4:40:02 PM EDT
[#37]
ETA on the Mod 2? CQB version planned?
Cheers |
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KIR
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Posted: 4/10/2014 6:05:31 PM EDT
[Last Edit: tac45]
[#38]
So I just had a conjugal visit with my new 14.5 SR15 SBR. I have one other SR15E3. Maybe it's because my older SR15 has been beat to hell in class after class, but I have to say my new 14.5 SBR is absolutely AMAZING
! I wish I would have bought two.
Does anyone else think the ultimate SR15 would be a culmination of all of KAC's proprietary features? Say a ball milled 14.5 medium profile barrel with the new Mod2 gas system, URX4 rail and the SR16 carbon cutter bolt carrier. Please build this and don't mind the cost, I will pay it!
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Posted: 4/10/2014 10:57:45 PM EDT
[#39]
Quote HistoryOriginally Posted By tac45:
So I just had a conjugal visit with my new 14.5 SR15 SBR. I have one other SR15E3. Maybe it's because my older SR15 has been beat to hell in class after class, but I have to say my new 14.5 SBR is absolutely AMAZING ! I wish I would have bought two.
Does anyone else think the ultimate SR15 would be a culmination of all of KAC's proprietary features? Say a ball milled 14.5 medium profile barrel with the new Mod2 gas system, URX4 rail and the SR16 carbon cutter bolt carrier. Please build this and don't mind the cost, I will pay it! That would be one awesome damn rifle. |
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Posted: 4/12/2014 8:02:07 PM EDT
[#40]
Quote HistoryOriginally Posted By tac45:
Say a ball milled 14.5 medium profile barrel with the new Mod2 gas system, URX4 rail and the SR16 carbon cutter bolt carrier. Please build this and don't mind the cost, I will pay it! I need dis |
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Posted: 4/12/2014 9:06:32 PM EDT
[#41]
Quote HistoryOriginally Posted By cjwwd2:
I need dis Quote HistoryOriginally Posted By cjwwd2:
Originally Posted By tac45:
Say a ball milled 14.5 medium profile barrel with the new Mod2 gas system, URX4 rail and the SR16 carbon cutter bolt carrier. Please build this and don't mind the cost, I will pay it! I need dis Build it with a 3.1, pin a Mams on it and let Me know where to send the deposit. |
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LA, USA
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Posted: 4/13/2014 11:10:15 PM EDT
[#42]
Quote HistoryOriginally Posted By CROWDLG:
Build it with a 3.1, pin a Mams on it and let Me know where to send the deposit. Quote HistoryOriginally Posted By CROWDLG:
Originally Posted By cjwwd2:
Originally Posted By tac45:
Say a ball milled 14.5 medium profile barrel with the new Mod2 gas system, URX4 rail and the SR16 carbon cutter bolt carrier. Please build this and don't mind the cost, I will pay it! I need dis Build it with a 3.1, pin a Mams on it and let Me know where to send the deposit. As above. Either/or will be fine |
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AL, USA
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Posted: 4/14/2014 2:16:13 PM EDT
[#43]
Will the new gas system fit underneath a 3.1?
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Posted: 4/14/2014 4:19:46 PM EDT
[#44]
Quote HistoryOriginally Posted By CROWDLG:
Build it with a 3.1, pin a Mams on it and let Me know where to send the deposit. Quote HistoryOriginally Posted By CROWDLG:
Originally Posted By cjwwd2:
Originally Posted By tac45:
Say a ball milled 14.5 medium profile barrel with the new Mod2 gas system, URX4 rail and the SR16 carbon cutter bolt carrier. Please build this and don't mind the cost, I will pay it! I need dis Build it with a 3.1, pin a Mams on it and let Me know where to send the deposit. This would be my ultimate SR15 rifle. |
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Posted: 4/14/2014 4:34:55 PM EDT
[#45]
Quote HistoryOriginally Posted By an_hero:
Will the new gas system fit underneath a 3.1? No |
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AL, USA
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Posted: 4/14/2014 4:57:58 PM EDT
[#46]
Quote HistoryOriginally Posted By KevinB:
No Quote HistoryOriginally Posted By KevinB:
Originally Posted By an_hero:
Will the new gas system fit underneath a 3.1? No 
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Posted: 4/20/2014 2:05:34 PM EDT
[Last Edit: boltcarrier]
[#47]
Quote HistoryOriginally Posted By KevinB:
No Quote HistoryOriginally Posted By KevinB:
Originally Posted By an_hero:
Will the new gas system fit underneath a 3.1? No Any details on this? What about it doesn't work? |
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Posted: 4/20/2014 2:16:04 PM EDT
[#48]
Quote HistoryOriginally Posted By boltcarrier:
Any details on this? What about it doesn't work? Quote HistoryOriginally Posted By boltcarrier:
Originally Posted By KevinB:
Originally Posted By an_hero:
Will the new gas system fit underneath a 3.1? No Any details on this? What about it doesn't work? In looking at the pictures I'm guessing the width of the nut to secure the gas tube. I'm a fan of the URX4, but not being able to put the 3.1 on is going to drive a large market away. |
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Posted: 5/14/2014 10:02:46 AM EDT
[#49]
Ray just pointed me to this thread and he said the dudes test firing this gun were grinning ear to ear at the performance.
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FL, USA
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Posted: 5/29/2014 11:56:42 AM EDT
[#50]
Is it possible to remove a URX 4 rail without taking apart a mod 2 gas block & gas tube? That gas block & gas tube combo looks brilliant, but I'm trying to wrap my head around how a URX 4 & mod 2 combo is assembled/disassembled...
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