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Posted: 12/7/2020 12:07:25 PM EDT
Got tired of looking through mini RECCE and the SBR threads for one of the least common barrel sizes (currently).

Post'em if you got'em, I need some inspiration. Maybe we can turn this into an official 12.5 thread!

ETA: Rail and barrel specs would be great

Link Posted: 12/7/2020 12:11:27 PM EDT
[#1]


12.5" Compass Lake in 223CLE with Reflex can.
Link Posted: 12/7/2020 12:12:37 PM EDT
[#2]


Link Posted: 12/7/2020 12:35:31 PM EDT
[#3]
12.5 Mid length AR with a side of 5.56 Ak in 12.5:



Link Posted: 12/7/2020 12:41:17 PM EDT
[#4]
Discussion ForumsJump to Quoted PostQuote History


This rifle, with can pic, never gets old
Link Posted: 12/7/2020 12:53:36 PM EDT
[#5]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


This rifle, with can pic, never gets old
View Quote


Thanks man, I appreciate that.
Link Posted: 12/7/2020 12:58:44 PM EDT
[#6]


Heavy old can, heavy rail, but I like it.
Link Posted: 12/7/2020 1:00:19 PM EDT
[#7]
12.5 all Daniel Defense, Geissele 10.5" mk16, SSA, SF Socom RC, TA31 ECOS, PEQ-15, SF m300 vampire floppy light, BFG VCASAttachment Attached File

Link Posted: 12/7/2020 1:00:24 PM EDT
[#8]
Discussion ForumsJump to Quoted PostQuote History


Here's mine in current configuration. I've got that little TNVC/Steiner IR laser hidden by the flashlight.

Attachment Attached File
Link Posted: 12/7/2020 1:02:10 PM EDT
[#9]
Nice! Keep'em coming guys. I'm thinking about building an upper with a 12.5 BA and 10" QRF rail but I want to see what else is out there.




I think I may consider the MCMR also
Link Posted: 12/7/2020 1:26:33 PM EDT
[#10]
Has a Leupold optic now.

Link Posted: 12/7/2020 1:31:55 PM EDT
[#11]
Discussion ForumsJump to Quoted PostQuote History


Is that rail 11.5"? It meets up perfectly with the suppressor/adapter
Link Posted: 12/7/2020 1:32:06 PM EDT
[#12]
glitch
Link Posted: 12/7/2020 2:35:31 PM EDT
[#13]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


Is that rail 11.5"? It meets up perfectly with the suppressor/adapter
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Quoted:


Is that rail 11.5"? It meets up perfectly with the suppressor/adapter


Bought as complete upper from Mico MOA, has Govnah to adjust gas. I think they had the handguard custom made. Says 11.75"

eta: the QD mount moves the can out another 1/4"

12.5" Midlength Fluted 5.56 NATO 1/7 SRU (Suppressor-Ready-Upper)
( 11.75" SOT MLOK Rail)
Link Posted: 12/7/2020 4:51:28 PM EDT
[#14]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


Bought as complete upper from Mico MOA, has Govnah to adjust gas. I think they had the handguard custom made. Says 11.75"

eta: the QD mount moves the can out another 1/4"

View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:


Is that rail 11.5"? It meets up perfectly with the suppressor/adapter


Bought as complete upper from Mico MOA, has Govnah to adjust gas. I think they had the handguard custom made. Says 11.75"

eta: the QD mount moves the can out another 1/4"

12.5" Midlength Fluted 5.56 NATO 1/7 SRU (Suppressor-Ready-Upper)
( 11.75" SOT MLOK Rail)


I'm finding anything under .75-.8" from barrel to rail length starts to get really close for fitment comfort.
Link Posted: 12/7/2020 4:57:56 PM EDT
[#15]
12.5 Triarc
Attachment Attached File



Link Posted: 12/7/2020 8:54:07 PM EDT
[#16]
Attachment Attached File


That was when new. It’s been tweaked a bit, but has become my favorite rifle. I have a KINO as well. I love 12.5s
Link Posted: 12/7/2020 9:05:23 PM EDT
[#17]


.308 with 12.5 BA barrel
Link Posted: 12/7/2020 9:16:33 PM EDT
[#18]
My 12.5 built on a MEGA lower and a complete BCM upper.

DSC_1660 by FredMan, on Flickr

DSC_1654-SBR Entire by FredMan, on Flickr
Link Posted: 12/7/2020 11:12:45 PM EDT
[#19]
Master Race thread

Link Posted: 12/7/2020 11:27:06 PM EDT
[#20]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Master Race thread

https://i.imgur.com/Hgh1XcB.jpg
View Quote



How are you liking that rail? I just got one for yet another 12.5 build
Link Posted: 12/7/2020 11:42:54 PM EDT
[#21]
My New Jersey  Legal  "Other ".

Attachment Attached File


Attachment Attached File
Link Posted: 12/8/2020 12:30:00 AM EDT
[#22]
She's had a couple changes

12.5 criterion coreAttachment Attached File
Link Posted: 12/8/2020 12:39:44 AM EDT
[#23]
Discussion ForumsJump to Quoted PostQuote History
Quoted:



How are you liking that rail? I just got one for yet another 12.5 build
View Quote

I'm a big fan of the newer Midwest Industries rails.  They're probably the most underrated handguards out there.  Cheaper and considerably lighter than the BCM/Geissele rails.  I have this one (11.5"), a 7" and a 15" Combat LW.
Link Posted: 12/8/2020 7:44:35 AM EDT
[#24]
Nice builds guys!  I like them all!

Discussion ForumsJump to Quoted PostQuote History
Quoted:

I'm a big fan of the newer Midwest Industries rails.  They're probably the most underrated handguards out there.  Cheaper and considerably lighter than the BCM/Geissele rails.  I have this one (11.5"), a 7" and a 15" Combat LW.
View Quote


I 2nd this.  They don't get enough love.  They make some really quality machined parts.  Their drop-in rails are really light and nice too.
Link Posted: 12/8/2020 10:38:29 AM EDT
[#25]


I'm really digging the Triarc and Hodge wedge lock rails

Quoted:
https://imgdump5.novarata.net/0nsds4.jpg

.308 with 12.5 BA barrel
View Quote


That's sexy af
Link Posted: 12/8/2020 10:46:30 AM EDT
[#26]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
https://imgdump5.novarata.net/0nsds4.jpg

.308 with 12.5 BA barrel
View Quote



A .308  in 12.5 ??

I am very impressed.   Do you use a suppressor?
Link Posted: 12/8/2020 10:57:29 AM EDT
[#27]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
https://imgdump5.novarata.net/0nsds4.jpg

.308 with 12.5 BA barrel
View Quote

Link Posted: 12/8/2020 11:07:59 AM EDT
[#28]
I didn't know that the 10.75" URX 3.1 was discontinued until now. Saw this build and started looking around to see who had some in stock

From reddit:
Attachment Attached File
Link Posted: 12/8/2020 9:41:42 PM EDT
[#29]
Discussion ForumsJump to Quoted PostQuote History



What am I seeing here? Looks to be a KMR 10? Is that an 11.5 barrel then?
Link Posted: 12/8/2020 9:43:26 PM EDT
[#30]
6.5 Grendel... 12.5" Ballistic Advantage Hansen profile barrel, BA Bolt, Colt Carrier, KAC trigger guard and selector, Larue MBT, Larue LT-104CAN, Vortex PST 1-4x Gen1, Geissele FBI rail, and Maxim PDW RE with a SB tactical brace. Needs some BUIS sooner or later to be "done"...

Attachment Attached File
Link Posted: 12/9/2020 5:54:24 AM EDT
[#31]
Quoted:
What am I seeing here? Looks to be a KMR 10? Is that an 11.5 barrel then?
View Quote

I was wondering the same. I didn't think they made the KMR in 11.


Quoted:
6.5 Grendel... 12.5" Ballistic Advantage Hansen profile barrel, BA Bolt, Colt Carrier, KAC trigger guard and selection, Larue MBT, Larue LT-104CAN, Vortex PST 1-4x Gen1, Geissele FBI rail, and Maxim PDW RE with a SB tactical brace. Needs some BUIS sooner or later to be "done"...
https://www.AR15.Com/media/mediaFiles/2980/8227B414-77FB-4528-9C5F-07A4A57C336F_jpe-1721774.JPG
View Quote


12.5 Grendel is a beast of a setup. Truly ideal for a do it all rifle with crazy performance in a small package.
Link Posted: 12/9/2020 8:45:08 AM EDT
[#32]
Dunno if this counts, more of a 16" with the FH on. One of these days I'll swap the rail for a tube.


Link Posted: 12/9/2020 1:16:17 PM EDT
[#33]
^Still g2g in my book since it's a 12.5 barrel

To all; Before I placed my order for my 12.5 BA I was researching the gas port size and came across this awesome spread sheet someone made and shared

AR-15 5.56/.223 Gas Port Size

It has all the 12.5" barrels from known brands, at least that I can think of.
Link Posted: 12/9/2020 1:58:15 PM EDT
[#34]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
^Still g2g in my book since it's a 12.5 barrel

To all; Before I placed my order for my 12.5 BA I was researching the gas port size and came across this awesome spread sheet someone made and shared

AR-15 5.56/.223 Gas Port Size

It has all the 12.5" barrels from known brands, at least that I can think of.
View Quote


Every 12.5 on that list has Carbine gas, my 12.5 is Mid with regulator plate holes .073/.055/.082. I use .055 with a K can. .073 is for unsuppressed and .082 for really dirty or crappy ammo.
Link Posted: 12/9/2020 3:33:15 PM EDT
[#35]
Does gas block journal profile affect port size?

Ie. .750 vs .625?
Link Posted: 12/9/2020 5:05:31 PM EDT
[#36]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Does gas block journal profile affect port size?

Ie. .750 vs .625?
View Quote


Negative, it should not
Link Posted: 12/9/2020 5:13:23 PM EDT
[#37]
12.5 Grendel on the bottom
Link Posted: 12/10/2020 2:31:07 PM EDT
[#38]
Discussion ForumsJump to Quoted PostQuote History


I can just imagine how easily that 6.5g drops hogs. Like a rock!
Link Posted: 12/10/2020 3:27:25 PM EDT
[#39]
12.5” Noveske 300blk about an hour before dropping a nice doe with a 110gr Barnes black tip. Dropped on the spot.

Link Posted: 12/11/2020 11:34:28 AM EDT
[#40]
^Nicely done. It would've been awesome to see that in action

Link Posted: 12/11/2020 10:58:46 PM EDT
[#41]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
I didn't know that the 10.75" URX 3.1 was discontinued until now. Saw this build and started looking around to see who had some in stock

From reddit:
https://www.AR15.Com/media/mediaFiles/443802/images__15__jpeg-1720677.JPG
View Quote



They can be found still. They’re going to be more than MSRP though.

I’ve been stocking up on older URX’s since the 4 came out. I’m not a fan, and the 10.75” URX 3.1 is the pinnacle of AR rails in my opinion. They’re perfect.
Link Posted: 12/12/2020 10:07:02 AM EDT
[#42]
Discussion ForumsJump to Quoted PostQuote History
Quoted:



They can be found still. They’re going to be more than MSRP though.

I’ve been stocking up on older URX’s since the 4 came out. I’m not a fan, and the 10.75” URX 3.1 is the pinnacle of AR rails in my opinion. They’re perfect.
View Quote


Not to derail the thread but can you expand on that. I have URX 3.1 13.5", it came on a 16" AAC upper.
I didn't even know what it was until I decided to change the barrel, now I know a lot and have a wrench. The barrel nut is an unusual setup. This was my time first changing a barrel to.
What makes this $300 rail better (in your opinion) than the popular ones that are $150. Not being a dick, I just wonder. Most of my AR stuff is mid tier at best.
Link Posted: 12/12/2020 10:42:10 AM EDT
[#43]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


Not to derail the thread but can you expand on that. I have URX 3.1 13.5", it came on a 16" AAC upper.
I didn't even know what it was until I decided to change the barrel, now I know a lot and have a wrench. The barrel nut is an unusual setup. This was my time first changing a barrel to.
What makes this $300 rail better (in your opinion) than the popular ones that are $150. Not being a dick, I just wonder. Most of my AR stuff is mid tier at best.
View Quote


The KAC logo mostly. I have a couple and while I like them I don't really agree that they are the pinnacle of AR development.

The mounting system seems very robust but I'm not convinced it's really any stronger than something with a massive barrel nut like a geissele. Perhaps it achieves something similar with a lower weight than having a big chunk of metal there. I like the mounting system and think it's pretty innovative overall though.

In terms of strength it does have a bit more of the I beam profile of quad rails which probably helps vs a tube style, but the fact that it's a 2 piece likely negates any of that benefit. If you have the bottom half removed on a 13.5" you can definitely flex the top portion pretty easily if you squeeze tightly in the horizontal direction. I guess this shouldn't be a surprise really given that half the support is removed. It does seem really stiff in the vertical direction. Once the lower half is bolted up with a few bolts it's very solid. Ergonomically I don't really like it as much for a c clamp grip as some other modern rails but that's all preference.

I don't own other KAC stuff but I've always been drawn to their looks and the 3.1 is no exception. It's a quality piece that is a solid choice but if you are going for bang for the buck there are better options IMO, at least at full MSRP. I got mine way below retail price...
Link Posted: 12/12/2020 12:08:27 PM EDT
[#44]
Thanks for the info.
I didn't know why the AAC upper listed for $900, now I know it came with a $300 rail. I got it for $600, it is very nice.
Link Posted: 12/12/2020 12:38:00 PM EDT
[#45]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


I’ve been stocking up on older URX’s since the 4 came out. I’m not a fan, and the 10.75” URX 3.1 is the pinnacle of AR rails in my opinion. They’re perfect.
View Quote


I agree. I have the 13" URX 3.1 waiting back home for me that will eventually end up on a RECCE type build with PWS lower. URX 3.1 along with the DD RIS II and G MK8 are my favorites.
Link Posted: 12/12/2020 12:42:39 PM EDT
[#46]
12.5" BRT Optimim MRC Barrel. EXC length gas system (falls between carbine and midlength). SIG Romeo4M +4x. Surefire RC2.









Link Posted: 12/12/2020 1:41:41 PM EDT
[#47]
Attachment Attached File
Attachment Attached File


Hodge and Centurion IMO are the kings of the 12.5” barrels.
Link Posted: 12/12/2020 1:59:11 PM EDT
[#48]
Just re-railed mine with a FCD/CMT 11.5. Barrel is a Hodge 12.5.





Previous setup was using FCD/Centurion rail. Great rail just a tad bulky for me.

Link Posted: 12/12/2020 4:11:12 PM EDT
[#49]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Just re-railed mine with a FCD/CMT 11.5. Barrel is a Hodge 12.5.

https://i.imgur.com/WLpa7Op.jpg

https://i.imgur.com/y1c5CTL.jpg

Previous setup was using FCD/Centurion rail. Great rail just a tad bulky for me.

https://i.imgur.com/2XP2VKh.jpg
View Quote


I've been hoping to see some Hodge and FCD rails! I may go with the FCD RHF or Hodge wedge.

@Outrider Does FCD make the CMT anymore? The RHF is the only one on their site, and their is a difference. The RHF has the lightning cuts going down the side, but I prefer the clean look of the CMT.
Link Posted: 12/12/2020 4:33:28 PM EDT
[#50]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


I've been hoping to see some Hodge and FCD rails! I may go with the FCD RHF or Hodge wedge.

@Outrider Does FCD make the CMT anymore? The RHF is the only one on their site, and their is a difference. The RHF has the lightning cuts going down the side, but I prefer the clean look of the CMT.
View Quote


I ordered mine recently from Weapon Outfitters if that helps.
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