15" Troy Alpha install?

thecatch8 · Apr 12, 2014

Anyone have experience swapping out their heavy UTG quad on their 15T? This is supposed to be a direct drop in using the existing standard barrel nut. But one concern, what are we considering standard? I like that it's lighter, FDE to go with my FDE furniture, and that it's modular without all the quads.

https://troyind.com/products/alpha-15-fde

this is standard?

Nut that is on the 15T:

cyphertext · Apr 12, 2014

The top pic is the standard barrel nut. The bottom pic is a barrel nut like many, but not all, free float tubes use. I've actually seen it called "free float barrel nut" in catalogs and vendor web pages.

thecatch8 · Apr 12, 2014

So cypher, will the Alpha work on the 15T barrel nut? On all the installation videos I have seen, everyone is utilizing the nut on the top not the 15T nut.....

cyphertext · Apr 12, 2014

thecatch8 said:
So cypher, will the Alpha work on the 15T barrel nut? On all the installation videos I have seen, everyone is utilizing the nut on the top not the 15T nut.....

I think the nut on top is what you would need, but I don't have an Alpha rail... just been drooling over them... but JaPes does!

Many of the rails that I have seen that require a nut other than the standard one include the nut in the kit. You could always give Troy a buzz and see to be sure though.

cyphertext · Apr 12, 2014

Looks like the inside of that rail is cut where the teeth of the standard nut lock in with it...

WU_Who · Apr 12, 2014

The Troy alpha has a bunch of channels on the inner diameter that lines up with the "teeth" of the standard barrel nut at the 11 o'clock position. Once the rail and receive met, rotate the rail to 12 o'clock position and lock it down with three hex screws (that is if it is a newer Troy alpha rail). I installed the 13" inch, lately I wished I got the 15". Congrats on your upgrade. If you run a Q.D. sling check out the micro Q.D. sling mounts for that rail. Best way to go.

WU_Who · Apr 12, 2014

Cyphertext is faster...and with pics.

thecatch8 · Apr 12, 2014

and of course after reading the Manual, S&W haven't updated their information and still have the old 15T utilizing the Troy rail.

cyphertext · Apr 12, 2014

But you came with real experience!

cyphertext · Apr 12, 2014

thecatch8 said:
and of course after reading the Manual, S&W haven't updated their information and still have the old 15T utilizing the Troy rail.

You wouldn't expect them to change the manual for such a "minor" difference, would you?

thecatch8 · Apr 12, 2014

So it looks like the 15T nut is specific for Leapers UTG rails that are not slim or light. The only thing that will match up is the same crappy UTG rail. From the looks of their sight....they have a contract with S&W....sigh

Leapers, Inc. - Hunting/Shooting, Sporting Goods and Security Gear

thecatch8 · Apr 12, 2014

cyphertext said:
But you came with real experience!

what are you talking about?

cyphertext · Apr 12, 2014

thecatch8 said:
what are you talking about?

Wu Who has a Troy rail that he has installed... first hand knowledge vs. me finding a pic.

He said my reply was faster, but his has more detail on how it actually locks in.

JaPes · Apr 12, 2014

The troy Alpha rail clamps down to a stock mil-spec barrel nut via three screws. Easy-Peasy.

Wu-Who beat me to it.

thecatch8 · Apr 12, 2014

Okay, I took off the rail, it's basically four bolts and this is what is left:

So you would have to remove the LP gas block and gas tube to remove the nut. Looks like I will be doing some basic gunsmithing.

cyphertext · Apr 12, 2014

JaPes said:
Wu-Who beat me to it.

I beat you both... but I did call out for your experience with this rail.

cyphertext · Apr 12, 2014

thecatch8 said:
So you would have to remove the LP gas block and gas tube to remove the nut. Looks like I will be doing some basic gunsmithing.

This is why the free float tube that I purchased from another forum member is still sitting in my parts box. I find something else to do every time I think about it.

thecatch8 · Apr 12, 2014

Just a heads up for anyone removing their gas block.....there is a taper pin in addition to the set screws that you have to drive out. From what I have read it is a PITA, but if you lube it up and let it sit it will drive right out. It is taperd, so you have to tap it right to left. More to come!

https://www.youtube.com/watch?v=-gv1A9lh0MI

JaPes · Apr 12, 2014

I'm curious. Is the single pin tapered as the two pins found on other M&P-15 rifles with an A2 front sight post?

thecatch8 · Apr 12, 2014

Not sure....I would think so. I'm waiting on a new wrench and vise block tool to get shipped so I don't jack up my existing barrel nut and twist the upper and barrel. If you look at the taper pin, you can see that one end is slightly wider than the other, so obviously you would want to tap from the smaller end out with the fatter end protruding first.

15" Troy Alpha install?

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