11.5 M-Lok Rails for a 12.5 build? Do they exist from a Tier One maker?

**M4Fundi** · 09-12-22, 03:29

Title says it all.11.5 M-Lok Rails for a 12.5 build? Do they exist from a Tier One maker?

**Wake27** · 09-12-22, 03:49

There’s not many. CMT has some, FCD has a slight variation that CMT produces for them. I just got an SLR Ion because as much as I like FCD, I prefer 7-sided MLOK rails. The SLR seems solid and is very well machined.

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**1168** · 09-12-22, 05:35

Rails that are nominally 12”, including the poorly named DDM4 12.0”, are usually ~12.5” and will not play nice with 12.5” barrels. The longest rails that work well are:
Larue Quad or LAT 11”
KAC URX4 10.75”
BCM QRF10
SLR 11.7”
Triarc Wedgelock 11.5”
FCD/CMT RHF 11.5”
Troy Battlerail 10.75”
Midwest 11.5”
G Mk8/16 10.5”
DD M4/MFR/MFR XL 10”
Aero 10.7”
My preference is Larue or KAC. All of the above 10.0” and 11.0” rails are slightly longer than advertised. Some have built in swivels, some don’t. Most MLok rails are skinny as ****.

**JediGuy** · 09-12-22, 06:16

There is currently an SLR Helix 11.7” offered in the equipment exchange.

**CRAMBONE** · 09-12-22, 08:00

I wanted a 12.5” barrel because I want to try a 12.5” mid length but the lack of rail selection has caused me to settle on a 11.5”.

**TMS951** · 09-12-22, 08:32

The best I’ve seen, and what I’m doing is a 13.5” Geissele mk16 cut down to ~11.75”

I know this is not what you’re asking. But when I went in search of what you are, this was my conclusion.

**Alex V** · 09-12-22, 09:53

LaRue makes an 11" MLok rail... Pretty good deal at $135 I think.

https://www.larue.com/products/larue...ny-handguards/

**rushca01** · 09-12-22, 10:02

Originally Posted by Alex V

LaRue makes an 11" MLok rail... Pretty good deal at $135 I think.

https://www.larue.com/products/larue...ny-handguards/

Still one of my favorite rails even if it’s a little “dated” by today’s standard. Still a rock solid mounting solution, it seems like in the last 10 years M Larue has gotten a lot of hate, especially since 10 years ago he was king of the cats meow in mounts and rails.