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HD-48
12 January 2017, 03:29
Does anybody know where I can find a free float 15in rail to fit a piston system and A2 notch? Nearly impossible I've come to find. Cmmg mod4sa is the intended gun

HD-48
12 January 2017, 04:35
Also I should mention, the muzzle is hard attached so the A2 is unable to be removed.

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GOST
12 January 2017, 05:26
You'll have to use a 2 piece rail system like a Midwest Industries, or a Troy Delta. Does the CMMG have a carbine length piston system? If so I don't think I've ever seen one that's 15", most are around 12". Do you want a quad or smooth? I'm unfamiliar with the mod2sa, so I'm not sure if these options are compatible. The Midwest Industries is the higher quality of those options.

http://www.midwayusa.com/product/181884/midwest-industries-gen-2-free-float-2-piece-handguard-quad-rail-ar-15-extended-carbine-length-aluminum-black

http://www.sportsmansguide.com/product/index/ncstar-ar-15-carbine-extended-keymod-handguard?a=1817641

http://www.opticsplanet.com/vism-ar15-m-lok-carbine-handguard.html

https://troyind.com/rail-systems-accessories/rails/drop/delta

HD-48
12 January 2017, 05:31
I'm hoping to hear back from Leapers if their rail will fit a piston but I know Troy doesn't. Looking for a smooth, after hearing all the "cheese grader" comments.

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GOST
12 January 2017, 05:36
The cheese grater comments is just an internet myth. One guy reads it and spreads it around like a STD. I used quad a lot without gloves and never had a problem with comfort. The biggest difference to me is that if you have small hands and use a thumb over bore grip, the quads are a little bigger in diameter.

GOST
12 January 2017, 05:43
I assume that this is the rail your referring to.

https://www.leapers.com/prod_detail.php?mitem=mount&level1=&level2=&itemno=MTU015SS&status=&mtrack=m

I have no experience with their products. If your wanting smooth I would consider using a shorter option like the Troy delta. The Troy is a better quality product.

HD-48
12 January 2017, 05:52
Yeah that's the one. I emailed Troy asking about one of their products that fits an A2 and they said all their rails are for DI gas systems.

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JoshAston
12 January 2017, 05:58
Why is the muzzle device pinned and welded? Is it a 14.5" or do you live in a ban state?

Also, if you've got an A2 front sight base, I don't believe you've got a piston unless you added an aftermarket that doesn't utilize a dedicated gas block. The CMMG piston system utilizes a dedicated gas block that has a picatinny rail on top.

HD-48
12 January 2017, 06:10
As far as I know, the cmmg mod4sa is a 14.5 with a hard mount muzzle to make it legal. A2 piston system carbine

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HD-48
12 January 2017, 06:17
https://youtu.be/cy5iIrQLbiE hard to find much else on this gun

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JoshAston
12 January 2017, 06:25
Take the handguards off, I'm pretty sure you'll find a gas tube, not a piston.

Here's what the piston version looks like
2510

HD-48
12 January 2017, 07:06
https://uploads.tapatalk-cdn.com/20170112/b7bb7f9e498e46248a514ca765162ca6.jpg
I hope you're right. Is there anything you can tell from this picture? I don't own the gun yet but that's an aftermarket short rail right?

GOST
12 January 2017, 07:07
That rifle is DI, not a piston.

Thompson
12 January 2017, 07:59
The cheese grater comments is just an internet myth. One guy reads it and spreads it around like a STD. I used quad a lot without gloves and never had a problem with comfort. The biggest difference to me is that if you have small hands and use a thumb over bore grip, the quads are a little bigger in diameter.
I don't know - I've handled some sharp edged KAC rails in the past. Granted, I've never sliced my hand open either.

GOST
12 January 2017, 08:20
I don't know - I've handled some sharp edged KAC rails in the past. Granted, I've never sliced my hand open either.

Your tender paws is a result of using to much lotion.

Thompson
12 January 2017, 08:22
Your tender paws is a result of using to much lotion.
Can't get anymore tactical, without have nice soft hands now can we?

Deadwing
14 January 2017, 00:11
The cheese grater comments is just an internet myth. One guy reads it and spreads it around like a STD. I used quad a lot without gloves and never had a problem with comfort. The biggest difference to me is that if you have small hands and use a thumb over bore grip, the quads are a little bigger in diameter.

I actually still prefer quad rails, or rail with a similar profile (like the Geissele Mk8). The "sharpest", if one could even describe it as such, quad rail i've ever shot was a Troy Bravo (sharper than any of the KAC rails i own or have handled), and even that could comfortably be shot for extended period with bare hands.

UWone77
14 January 2017, 00:14
https://uploads.tapatalk-cdn.com/20170112/b7bb7f9e498e46248a514ca765162ca6.jpg
I hope you're right. Is there anything you can tell from this picture? I don't own the gun yet but that's an aftermarket short rail right?

If you don't own the gun yet, I'd just pass on it. You can do much better than that abortion.

Deadwing
14 January 2017, 00:30
If you don't own the gun yet, I'd just pass on it. You can do much better than that abortion.

Easy, man... It's a Precision Designated Special Purpose CQBR Marksman Rifle.

FortTom
14 January 2017, 04:07
If you don't own the gun yet, I'd just pass on it. You can do much better than that abortion.


Easy, man... It's a Precision Designated Special Purpose CQBR Marksman Rifle.
Glad you guys said that, I didn't have the heart too.

On the other hand, purchase your next weapon, choosing the configuration that will let you modify, if necessary, it so as to end up with what you have in mind. It's hard to "back-solve' someone else's problem, or idea's to fit yours, unless you can readily eyeball the weapon and know right away that you can do what you want to achieve with it. Sometimes, if you're not a good gun mechanic (not saying you're not) and don't have access to a milling machine and a lathe, it's tough to make a lot of mods. If you have to pay to have them all done, you might be getting into a very expensive build.

Good luck, and let us know how things work out.

FT[:D]

FortTom
14 January 2017, 09:32
The cheese grater comments is just an internet myth. One guy reads it and spreads it around like a STD. Isn't that true about everywhere, internet? Now, I've got to go tear a Centurion Quad off of one of mine. Next time I shoot it, my paws might look like hamburger. Don't know how I avoided that before.[wow]

Joelski
16 June 2017, 03:58
Isn't that true about everywhere, internet? Now, I've got to go tear a Centurion Quad off of one of mine. Next time I shoot it, my paws might look like hamburger. Don't know how I avoided that before.[wow]
Tom, check your pm's. I am sending you an airbill to ship me that Centurion. It will show up with a case of Jergen's for utmost mission integrity. There will never be issues with grater effect on your dickbeaters, and your "six" will always be covered. Just lookin' out for a bro!

TENTEX
16 June 2017, 06:04
I assume that this is the rail your referring to.

https://www.leapers.com/prod_detail.php?mitem=mount&level1=&level2=&itemno=MTU015SS&status=&mtrack=m

I have no experience with their products. If your wanting smooth I would consider using a shorter option like the Troy delta. The Troy is a better quality product.

I am running the UTG (Leapers) 15" UTG Pro Slim on my TX Aero and I can't be happier for $ 125 from Buds Gun. It also comes with a Mlock QD and Rail Section.

3669

GOST
16 June 2017, 13:53
I can honestly say that ^that^ Is the first time I've seen a UTG handguard and an ACOG on the same rifle.

TENTEX
19 June 2017, 09:55
I can honestly say that ^that^ Is the first time I've seen a UTG handguard and an ACOG on the same rifle.

I have bought and installed Geissele, SLR, MWI, Aero and UTG.

I would put the UTG Slim Pro fit and finish up against them.

My .02

That gun has a Green Mountain GM-M24-556 (1:8 twist, 18", Rifle length gas block) and it shoots pretty damn well with the IMI 77 Gr Razor Core at 100 yards suppressed.

3692

Joelski
19 June 2017, 13:11
Point is, you are using an Atlas QD bipod when a Harris would work "just as good". Granted, that rail looks good from 10 or so feet in a photo, but I've owned a UTG rail and I own Geissele rails. That doesn't compute. Everybody's been to that class.

TENTEX
19 June 2017, 13:52
Point is, you are using an Atlas QD bipod when a Harris would work "just as good". Granted, that rail looks good from 10 or so feet in a photo, but I've owned a UTG rail and I own Geissele rails. That doesn't compute. Everybody's been to that class.

Altas Bi-Pod with QD can go on any of my AR's equipped with MLock Rail section installed. Harris is past their time.

The barrel nut and attachment of the UTG is no different than others on the market so zero concern.

I have 13" Geissele MK1 Desert Dirt but I find it bulky compared to some of the other brands these days. Not sure why people want to now spend $500 on it.

I challenge people to pick up the UTG Slim Pro and see what you get for $130.

My point is why by a Geissele Trigger these days when you can get a Larue MBT for $99 plus the ride.

No Brainer.

UWone77
19 June 2017, 14:39
Harris is past their time? Hardly.

I have no issue with UTG. Their newer stuff seems to be on par with low-mid level offerings on the market. Nothing wrong with that.

I think they're going to have a hard time shaking the reputation of their earlier stuff, which was basically melted pot metal. I've swapped out several UTG components for friends over the years.

Good to see UTG improving though.

Thompson
19 June 2017, 14:42
I have 13" Geissele MK1 Desert Dirt but I find it bulky compared to some of the other brands these days. Not sure why people want to now spend $500 on it.

My point is why by a Geissele Trigger these days

Because they don't make them anymore.

Because it's combat proven.

TENTEX
5 July 2017, 07:59
Rail looks familiar [pop]

https://www.sigsauer.com/store/sigm400-elite-ti.html

SIGM400 ELITE TI

38163817

UWone77
5 July 2017, 09:50
Looks about right for a Sig offering.

Big_Tom
6 July 2017, 10:28
Altas Bi-Pod with QD can go on any of my AR's equipped with MLock Rail section installed. Harris is past their time.

The barrel nut and attachment of the UTG is no different than others on the market so zero concern.

I have 13" Geissele MK1 Desert Dirt but I find it bulky compared to some of the other brands these days. Not sure why people want to now spend $500 on it.

I challenge people to pick up the UTG Slim Pro and see what you get for $130.

My point is why by a Geissele Trigger these days when you can get a Larue MBT for $99 plus the ride.

No Brainer.


I buy triggers from both companies just depends on what purpose I have for the gun. And which trigger I want to have on it.


Over the years of building rifles I compiled a list of companies that have a excellent reputation for their CS. Most of those companies have gone above and beyond by helping me. I try to stay away from the companies that give their customers the cold shoulder. As for Leapers I couldn't tell you anything about their CS. But their previous products were junk and it's hard to shake that rep.

Big_Tom
6 July 2017, 13:52
And to add it has to do with the company's QC as well. And sure a company's QC dept will let a few bad apples out the door but that's where the CS comes to play.

And back to OP question. Don't buy that rifle. Figure out what you plan on using one for. And build you one the way you want it from the get go. Yes there will be things switched out after ward but you still will be cheaper then trying to fix that ugly thing the way you want it.