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Posted: 5/21/2018 8:01:42 PM EDT
[#1]
Urx 3.1s should fit, none of them have heat shields
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Posted: 5/21/2018 10:17:50 PM EDT
[#2]
urx 3 / 3.1 will work , urx 2 should work if you remove the heat shield
you'll need the mod 2 wrench and the urx 3 / 3.1 wrench my mod 2 cqb with a urx 3.1 
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Posted: 5/21/2018 10:43:30 PM EDT
[#3]
Quote HistoryQuoted:
urx 3 / 3.1 will work , urx 2 should work if you remove the heat shield you'll need the mod 2 wrench and the urx 3 / 3.1 wrench my mod 2 cqb with a urx 3.1 https://s19.postimg.cc/85vs75qc3/20180304_171427.jpg |
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Posted: 5/21/2018 11:29:11 PM EDT
[#4]
Quote HistoryQuoted:
Awesome gun. What optic is that? |
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Posted: 5/22/2018 12:53:12 AM EDT
[#5]
I would guess the FF RAS would work since I have seen a DD MK18RISII rail go on a Mod2 CQB upper.
The only URX2 I could see working on a Mod2 upper would be the 10.75. I don't think the Rifle URX2 (20547) would work with a Mod2 gas block because you'd need clearance for the front sight. I would love to know the answer to that. If you do happen upon a Rifle URX2 that has no front sight, that should work well on the Mod2 gas system. |
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Posted: 5/22/2018 2:05:46 AM EDT
[#6]
Quote HistoryQuoted: Looks like an ACOG TA02. |
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Posted: 5/22/2018 3:18:22 AM EDT
[#7]
I’ve been told that the gas block still needs to be clearanced with the 3.1.
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Posted: 5/22/2018 9:52:06 AM EDT
[#8]
Quote HistoryQuoted:
I’ve been told that the gas block still needs to be clearanced with the 3.1. OP, let me know if you need a Mod 2 gas block nut wrench. |
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Posted: 5/22/2018 10:01:39 AM EDT
[#9]
Quote HistoryQuoted:
I’ve been told that the gas block still needs to be clearanced with the 3.1. |
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Posted: 5/22/2018 10:14:33 AM EDT
[#10]
Quote HistoryQuoted:
Huh. I didn't know that. I've got a Mod 2 that I want to swap the URX 4 out to a 3.1. I guess I need to mock it up to see. Quote HistoryQuoted:
Quoted:
I’ve been told that the gas block still needs to be clearanced with the 3.1. |
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Posted: 5/22/2018 10:19:54 AM EDT
[#11]
Quote HistoryQuoted: Too bad Ayan isn't around anymore. He'd know for sure what's required to make it work. There is also a post on TOS saying it works but is pretty tight. |
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Posted: 5/22/2018 10:46:54 AM EDT
[#12]
Quote HistoryQuoted:
https://www.ar15.com/forums/industry/URX_3_1_on_Mod_2_compatible_/381-275585/ There is also a post on TOS saying it works but is pretty tight. Quote HistoryQuoted:
Quoted: Too bad Ayan isn't around anymore. He'd know for sure what's required to make it work. There is also a post on TOS saying it works but is pretty tight. OP, why are you swapping the URX4? Don't care for the keymod version, but my URX4 MLOK rails are my favorites. Any thoughts on what you'd like to use? |
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Posted: 5/22/2018 12:43:36 PM EDT
[#13]
I like the solid design of the URX 4 but I’m old school I guess with the 4 sided rail system.
My favorite rail is the FF RAS design but also like the 3.1 I just want to make sure they could work before messing with it. Plus I have never seen a SBR mod 2 11.5 with a FF RAS. If anyone has any pics of that combo please post! |
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Posted: 5/22/2018 1:58:22 PM EDT
[#14]
Quote HistoryQuoted: I like the solid design of the URX 4 but I’m old school I guess with the 4 sided rail system.
My favorite rail is the FF RAS design but also like the 3.1 I just want to make sure they could work before messing with it. Plus I have never seen a SBR mod 2 11.5 with a FF RAS. If anyone has any pics of that combo please post! |
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Posted: 5/22/2018 3:26:25 PM EDT
[#15]
Quote HistoryQuoted:
I like the solid design of the URX 4 but I’m old school I guess with the 4 sided rail system. My favorite rail is the FF RAS design but also like the 3.1 I just want to make sure they could work before messing with it. Plus I have never seen a SBR mod 2 11.5 with a FF RAS. If anyone has any pics of that combo please post! |
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Posted: 5/22/2018 3:30:08 PM EDT
[#16]
Quote HistoryQuoted:
urx 3 / 3.1 will work , urx 2 should work if you remove the heat shield you'll need the mod 2 wrench and the urx 3 / 3.1 wrench my mod 2 cqb with a urx 3.1 https://s19.postimg.cc/85vs75qc3/20180304_171427.jpg |
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Posted: 5/22/2018 4:35:11 PM EDT
[#17]
Quote HistoryQuoted: a lot of want, what acog is that? @1iviper 
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Posted: 5/22/2018 4:50:37 PM EDT
[#18]
as long as the urx 3 / 3.1 doesn't have the lower heat shield there is no clearance issue's with the mod 2 gas system. i believe only the older urx rails had the heat shield installed , they're easily removable as there are only 4 small rivets holding it to the rail
even when trying to flex the barrel by hand there isn't enough deflection to make the gas system touch the rail here's a few pics of the gas block inside the rail 
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Posted: 5/22/2018 4:56:57 PM EDT
[#19]
Quote HistoryQuoted:
as long as the urx 3 / 3.1 doesn't have the lower heat shield there is no clearance issue's with the mod 2 gas system. i believe only the older urx rails had the heat shield installed , they're easily removable as there are only 4 small rivets holding it to the rail even when trying to flex the barrel by hand there isn't enough deflection to make the gas system touch the rail here's a few pics of the gas block inside the rail https://s19.postimg.cc/sv9aq2tkz/20180220_141748.jpg https://s19.postimg.cc/ec25oofvn/20180220_141809.jpg https://s19.postimg.cc/hhmrfgqyb/20180220_142003.jpg https://s19.postimg.cc/3p8cj900j/20180220_142019.jpg |
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Posted: 5/22/2018 7:31:49 PM EDT
[#20]
Quote HistoryQuoted:
as long as the urx 3 / 3.1 doesn't have the lower heat shield there is no clearance issue's with the mod 2 gas system. i believe only the older urx rails had the heat shield installed , they're easily removable as there are only 4 small rivets holding it to the rail even when trying to flex the barrel by hand there isn't enough deflection to make the gas system touch the rail here's a few pics of the gas block inside the rail https://s19.postimg.cc/sv9aq2tkz/20180220_141748.jpg https://s19.postimg.cc/ec25oofvn/20180220_141809.jpg https://s19.postimg.cc/hhmrfgqyb/20180220_142003.jpg https://s19.postimg.cc/3p8cj900j/20180220_142019.jpg That must be what I was thinking about earlier. And you mentioned that even when flexing the barrel by hand, the gas block doesn't contact the rail. Do you think the same could be said for a 14.5"/16" Mod 2 running a URX3.1? They'll obviously have more flex than the 11.5" CQB barrel. And thanks for the pics. The Mod 2 gas system looks beautiful inside that URX3.1. |
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Posted: 5/22/2018 11:40:52 PM EDT
[#21]
Quote HistoryQuoted: @1iviper That must be what I was thinking about earlier. And you mentioned that even when flexing the barrel by hand, the gas block doesn't contact the rail. Do you think the same could be said for a 14.5"/16" Mod 2 running a URX3.1? They'll obviously have more flex than the 11.5" CQB barrel. And thanks for the pics. The Mod 2 gas system looks beautiful inside that URX3.1. |
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Posted: 5/23/2018 9:01:00 AM EDT
[#22]
Quote HistoryQuoted:
i think it would be fine , it takes alot of force to flex the barrel. Quote HistoryQuoted:
Quoted: @1iviper That must be what I was thinking about earlier. And you mentioned that even when flexing the barrel by hand, the gas block doesn't contact the rail. Do you think the same could be said for a 14.5"/16" Mod 2 running a URX3.1? They'll obviously have more flex than the 11.5" CQB barrel. And thanks for the pics. The Mod 2 gas system looks beautiful inside that URX3.1. |
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Posted: 5/23/2018 3:46:23 PM EDT
[#23]
I have a mod 2 with a geissele MK14 rail.
Works fine. |
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Posted: 5/24/2018 8:24:28 PM EDT
[#24]
Quote HistoryQuoted:
I have a mod 2 with a geissele MK14 rail. Works fine. Can you post a pic? |
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Posted: 5/24/2018 8:59:21 PM EDT
[#25]
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Posted: 5/24/2018 9:11:23 PM EDT
[#26]
Quote History |
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Posted: 5/24/2018 9:24:09 PM EDT
[#27]
Quote History@Marksman14 Beautiful, man! Beautiful! I should have my Mod 2 gas block socket from Cole in tomorrow, hopefully. I'm sending my 14.5" barrel over to Marvin for a full length dimple and I can't wait to get it back. I'm sticking with the URX4 MLOK, but your Mod 2/MK14 combo is stunning! Thanks for taking the time to post the pics! ETA: And it's funny that I saved the pics from the EE ad where you purchased that barrel and I literally JUST sent them to the OP minutes before you posted the pics! Too coincidental! 
I was so jealous when you scored that barrel and E3 BCG for a steal! I was just a second too late! I'm surprised to see you didn't grab an SR-15 upper to go with the barrel/BCG/lower? They can be tough to find, but I've managed to score a couple for different projects. |
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Posted: 5/24/2018 9:31:58 PM EDT
[#28]
Quote HistoryQuoted: @Marksman14 Beautiful, man! Beautiful! I should have my Mod 2 gas block socket from Cole in tomorrow, hopefully. I'm sending my 14.5" barrel over to Marvin for a full length dimple and I can't wait to get it back. I'm sticking with the URX4 MLOK, but your Mod 2/MK14 combo is stunning! Thanks for taking the time to post the pics! ETA: And it's funny that I saved the pics from the EE ad where you purchased that barrel and I literally JUST sent them to the OP minutes before you posted the pics! Too coincidental!
I was so jealous when you scored that barrel and E3 BCG for a steal! I was just a second too late! 
I never score EE deals like that. Of course now I have two complete factory MOD2 16" rifles, and now this guy on top of it, but I can't complain too much. Just not sure if I really need 3 16" setups
I really didn't care too much about the upper I used. KAC doesn't use anything fancy other than a normal mil-spec upper, so I figured AERO would do the job just fine. Not worth the premium especially when I'm not using a KAC "factory" rail. The guts make up for it 
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Posted: 5/24/2018 10:00:06 PM EDT
[#29]
Quote HistoryQuoted:
That deal was almost too good to be true
I never score EE deals like that. Of course now I have two complete factory MOD2 16" rifles, and now this guy on top of it, but I can't complain too much. Just not sure if I really need 3 16" setups
I really didn't care too much about the upper I used. KAC doesn't use anything fancy other than a normal mil-spec upper, so I figured AERO would do the job just fine. Not worth the premium especially when I'm not using a KAC "factory" rail. The guts make up for it Quote HistoryQuoted:
Quoted: @Marksman14 Beautiful, man! Beautiful! I should have my Mod 2 gas block socket from Cole in tomorrow, hopefully. I'm sending my 14.5" barrel over to Marvin for a full length dimple and I can't wait to get it back. I'm sticking with the URX4 MLOK, but your Mod 2/MK14 combo is stunning! Thanks for taking the time to post the pics! ETA: And it's funny that I saved the pics from the EE ad where you purchased that barrel and I literally JUST sent them to the OP minutes before you posted the pics! Too coincidental!
I was so jealous when you scored that barrel and E3 BCG for a steal! I was just a second too late!
I never score EE deals like that. Of course now I have two complete factory MOD2 16" rifles, and now this guy on top of it, but I can't complain too much. Just not sure if I really need 3 16" setups
I really didn't care too much about the upper I used. KAC doesn't use anything fancy other than a normal mil-spec upper, so I figured AERO would do the job just fine. Not worth the premium especially when I'm not using a KAC "factory" rail. The guts make up for it And having too many KAC's isn't a problem in my book, but like you said, it would be nice if they weren't all 16" guns. Props on it, though, man. She sure is putty. 
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