12.5" SBR Build

[drtywk]

I'm in the process of putting together a 12.5" gun to replace the one that I regret selling some time ago. I have all of the components together except for the rail. I am using a Ballistic Advantage 12.5" barrel and want to put the longest rail that I can use on it and still be able to mount a Silencerco Saker K via the direct thread adapter or a Trifecta FH. I am wanting to use a 12" MI SSM M-Lok Rail, but fear that I won't be able to mount my can either by direct thread or on the Saker Trifecta FH. Am I sh** out of luck here and should just get the 10.5" SSM or would I still have the clearance with the 12" rail?

[officerX]

I have no direct experience with the combo you're talking about. But from what I've seen, read and the advice I've been given the rail needs to be 3/4" shorter than the barrel. So you'd need an 11 3/4" rail. Good luck.

[Hemoglobin]

I love my ssm mlok rails. Make sure and shoot MI a email or dig around for lengths. It's pretty rare that the length is exactly the length they advertise and for some reason I seem to recall these rails being +/- either way depending on the one you select. Could be important when getting as close as you want.

[Rayrevolver]

EDIT, found this on M4C: The MI-SSK-12 weighs 8.5oz WITH the barrel nut, actual length is 12.625", OD is 1.5", ID is 1.3".


Usually the "carbine" rail and "midlength" rail are longer than advertised.

I bought a 9" SSK for a 9" AAC barrel and I knew it would have to be cut, the carbine 9" rail is actually 9.25". Didn't turn out too bad, although I don't have the can to do a final fit check. Worst case I will make a straight cut.

FWIW - SLR said they would make me one of their rails to any length I wanted. I was going to do the Solo Lite, but decided on the cheaper used MI-SSK and cut it.

[drtywk]

I ordered the 10.5" rail. Thanks for the reply everyone.

[dm_graham308]

Just curious how this turned out. I'm looking at doing a 12.5 barrel with my MI SSK12. Based on the pics by Rayrevolver, it looks like the 9" MI SSK rail( I know that it is actually 9.25") is equal to the 9" barrel. Looks like the 12" MI SSK rail would fit the 12.5" barrel in question with .5" left over.

[drtywk]

The 12" rail is actually 12 5/8" long, so it is too long for a 12/12.5" build if you plan on using a suppressor, which I am. The SSM/SSK is a great rail and has a lot of things I like, but I am going to be replacing it with a 10.75" M-Lok URX4 when they become available in the very near future.

[jstalford]

He said the MI SSK was 12.65". I would just get an SLR in 11.5"


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[dm_graham308]

Gotcha. Thanks for the reply/info. I was hoping that since a 9+" rail was about the same length as a 9" barrel that the 12" would leave .5" on a 12.5" barrel. Thanks again.

-Dave

[jstalford]

I've been looking for a rail for a 12.5 build and the best I've found length wise was the 11.5" SLR solo. Esp if you want mlok.

Would love if Geissele would do an 11" mk8


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