Now Shipping! CMMG's new RKM(Revo KeyMod) hand guards for the AR15 and Mk3/LR308 - Page 1

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[ARCHIVED THREAD] - Now Shipping! CMMG's new RKM(Revo KeyMod) hand guards for the AR15 and Mk3/LR308

Posted: 9/7/2013 8:46:55 AM EDT

RKM14 for Mk4/AR15 Rifles
MSRP: $199.95
Order Now!

Uses a standard receiver extension nut(castle nut) wrench to install the barrel nut. Features 2 QD sling mounts at the 3 and 9 o'clock positions.

Material: 6061-T6 Extruded Aluminum
Interface: KeyMod Universal Attachment System (3, 6, 9 o'clock positions) 1913 Picatinny Rail Top
Length: 14.25 Inches
Weight: 9.7oz (12.9oz with Barrel Nut)
Installation Instructions: RKM Installation

7",9" and 11" versions coming soon!

RKM15 for Mk3/LR308/SR25 type rifles
MSRP: $219.95
Order Now!

Material: 6061-T6 Extruded Aluminium
Interface: KeyMod Universal Attachment System (3, 6, 9 o'clock positions) 1913 Picatinny Rail Top
Length: 14.94 Inches
Weight: 13.3oz (17.1oz with Barrel Nut)
Installation Instructions: RKM Installation

Posted: 9/7/2013 11:59:07 AM EDT

[#1]

wow, very nice, ill order it right now if it will fit dpms low profile?

Posted: 9/7/2013 6:18:18 PM EDT

[#2]

I'm diggin' it. Looks like an NSR and a CMR had a bit of a run in.

Posted: 9/7/2013 8:01:30 PM EDT

[#3]

Wow thats a beautiful rail.

Posted: 9/8/2013 8:42:37 AM EDT

[#4]

I like it. So can I use NSR rail covers on this?

Posted: 9/8/2013 9:58:09 AM EDT

[#5]

Quote History

Quoted:
I like it. So can I use NSR rail covers on this?

View Quote

You can.

I have them on my CMMG 308.

Posted: 9/8/2013 1:36:12 PM EDT

[#6]

Yes please. Shorter lengths "coming soon". We talking weeks? months?

Posted: 9/8/2013 5:00:41 PM EDT

[#7]

Anyone know if it will fit dpms low profile ?

Posted: 9/8/2013 6:15:40 PM EDT

[#8]

Quoted:
Uses a standard receiver extension nut(castle nut) wrench to install the barrel nut.

View Quote

Clever, I like that

Posted: 9/8/2013 6:35:29 PM EDT

[#9]

Quote History

Quoted:
Anyone know if it will fit dpms low profile ?

View Quote

Without giving you 100% certainty, any reasonable low profile gas block should work with any rail. If it doesn't fit, it's a fail for the rail manufacturer *CMR cough*

Posted: 9/8/2013 8:08:29 PM EDT

[#10]

whats it look like with some rails and thingies on the sides?

Posted: 9/8/2013 8:40:59 PM EDT

[#11]

Quote History

Quoted:

Without giving you 100% certainty, any reasonable low profile gas block should work with any rail. If it doesn't fit, it's a fail for the rail manufacturer *CMR cough*

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Quote History

Quoted:

Quoted:
Anyone know if it will fit dpms low profile ?

Without giving you 100% certainty, any reasonable low profile gas block should work with any rail. If it doesn't fit, it's a fail for the rail manufacturer *CMR cough*

He was asking about the .308 rail height (being that .308 stuff isn't really standardized)

Posted: 9/9/2013 11:57:23 AM EDT

[#12]

Quote History

Quoted:
Anyone know if it will fit dpms low profile ?

View Quote

They match the older DPMS High profile uppers

Posted: 9/9/2013 8:11:32 PM EDT

[#13]

Great. I was waiting since the announcement for these. I bought a different rail a month and a half ago.

Posted: 9/10/2013 3:05:08 PM EDT

[#14]

Quote History

Quoted:
Yes please. Shorter lengths "coming soon". We talking weeks? months?

View Quote

Later this week... maybe next week.

Posted: 9/10/2013 7:47:47 PM EDT

[#15]

some close up pics of the area between the rail and the upper would be nice. Would like to see how the rail profiles match up with standard forged uppers. Can't really tell with the pics shown.

Posted: 9/11/2013 5:21:32 PM EDT

[#16]

Are you going to offer a wrench for these? If not, who's tool do you recomend?

I really hope you are going to offer a tool. It's been a big issue with the CMR rails since the tools that fit are not designed for the torque load and they ususlly don't have a spot for a torque wrench.

Posted: 9/11/2013 5:50:00 PM EDT

[#17]

Quote History

Quoted:
some close up pics of the area between the rail and the upper would be nice. Would like to see how the rail profiles match up with standard forged uppers. Can't really tell with the pics shown.

View Quote

I'd like to see this too.

Posted: 9/11/2013 5:52:20 PM EDT

[#18]

Where is it made?

Posted: 9/12/2013 10:03:02 AM EDT

[#19]

Quote History

Quoted:
Where is it made?

View Quote

It's 100% USA made.

Posted: 9/12/2013 1:47:00 PM EDT

[#20]

What is the I.D. On these ?

Posted: 9/13/2013 5:23:28 PM EDT

[#21]

Quote History

Quoted:

I'd like to see this too.

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Quote History

Quoted:

Quoted:
some close up pics of the area between the rail and the upper would be nice. Would like to see how the rail profiles match up with standard forged uppers. Can't really tell with the pics shown.

I'd like to see this too.

The thing to note here is that any mismatch is basically the upper's fault. With the manufacturing processes used, the variation part to part on the RKM's bore to rail height basically doesn't exist and is right on the nominal dimension for this feature.

Quoted:
whats it look like with some rails and thingies on the sides?

I'm already planning to work on a low profile TLR mount.

Posted: 9/13/2013 5:34:50 PM EDT

[#22]

Quote History

Quoted:
What is the I.D. On these ?

View Quote

~1.36" on the AR15 Models
~1.50" on the 308 Models

BTW

The 7",9" and 11" AR15 models are up on the website for sale and in stock.

Posted: 9/13/2013 6:08:56 PM EDT

[#23]

Quote History

Quoted:

~1.36" on the AR15 Models
~1.50" on the 308 Models

BTW

The 7",9" and 11" AR15 models are up on the website for sale and in stock.

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Quote History

Quoted:

Quoted:
What is the I.D. On these ?

~1.36" on the AR15 Models
~1.50" on the 308 Models

BTW

The 7",9" and 11" AR15 models are up on the website for sale and in stock.

Oh, Snap! Just ordered

Posted: 9/13/2013 6:15:10 PM EDT

[#24]

These look incredible.

What keeps it from twisting on the barrel nut?

Posted: 9/13/2013 6:33:45 PM EDT

[#25]

Quote History

Quoted:
These look incredible.

What keeps it from twisting on the barrel nut?

View Quote

Barrel nut is knurled, the hand guard is a very snug fit to start with and the screw clamp it down around it, as simple as it seems it's a very solid setup.

Posted: 9/13/2013 6:36:23 PM EDT

[#26]

Will you guys have your Mk14'ish rail covers like you did for the older revo rails too? Those were really appealing but you dropped the ball by only offering short versions.

Posted: 9/21/2013 4:15:00 PM EDT

[#27]

Anyone happen to have any pictures of these mounted to Mega MaTen upper or Mega billet AR15 uppers?

Posted: 9/22/2013 7:58:33 PM EDT

[#28]

If it only matches the older, high rail DPMS uppers, what good is it for any other 308 upper????

Posted: 9/22/2013 8:11:15 PM EDT

[#29]

Because DPMS, Bushmaster, Remington, and S&W are the only ones using the newer low receiver. Since, 3 of them are the exact same rifle, and the 4th uses more proprietary parts, why cater to the few, when you can make more money catering to the many?

Posted: 9/22/2013 8:20:42 PM EDT

[#30]

Well, apparently I had that bass-ackwards. I was thinking DPMS went to the lower receiver height because all the others were low, to somewhat standardize things. Apparently, DPMS just did pre-planned stupid?

Posted: 9/23/2013 5:45:43 AM EDT

[#31]

762AR556:
"... DPMS, Bushmaster, Remington, and S&W are the only ones using the newer low receiver."
Can you please explain further.
Thanks

Posted: 9/23/2013 9:30:07 AM EDT

[#32]

Quote History

Quoted:
Because DPMS, Bushmaster, Remington, and S&W are the only ones using the newer low receiver. Since, 3 of them are the exact same rifle, and the 4th uses more proprietary parts, why cater to the few, when you can make more money catering to the many?

View Quote

After reading that again, I guess I wasn't as confused on that as I thought? Who does stick to the higher pattern for uppers these days?

Posted: 9/23/2013 9:46:29 AM EDT

[#33]

I am very confused. This is something new to me - AR15 receiver variations?

Posted: 9/23/2013 12:48:25 PM EDT

[#34]

Quote History

Quoted:
I am very confused. This is something new to me - AR15 receiver variations?

View Quote

AR10/308 ARs. It's a source of confusion for myself and others. I've been into AR15s for 20 years or more, but just recently starting playing with/building 308 ARs, and going from mispec/common standard, to variances everywhere, has been a PITA.

Posted: 9/24/2013 8:31:49 PM EDT

[#35]

A couple years ago, DPMS changed their rail height. Not sure why, but I think it was to use more standard AR15 sights. Or, it might have just been an attempt to make their stuff more proprietary. Since DPMS, Bush, and Remington all use the exact same parts, they are all the same. I believe S&W chose to go with the DPMS rail height as well.

But, Armalite, SR25, Black Rain, Mega, just to name a few, use the SR25 style rail height. It makes building a 308 AR a total pain in the ass. But, if you stick with the 3rd party companies like Mega, BRO, JP Machine, you would have to use the older style DPMS rail height. Many companies are aware of this, and give you the option to chose. Some have stopped giving the option, so you just have to watch what you buy. No one wants to agree on a standard for the 308, which is entirely stupid. You have the SR25 and LMT MWS, so that should be your standard right there.

But everyone wants to be different and make their pie slice just a tad bit bigger.

Posted: 10/2/2013 4:12:00 PM EDT

[#36]

So you can use any rails or covers from other keymod systems on this?

Posted: 10/4/2013 6:43:53 AM EDT

[#37]

Quote History

Quoted:

Barrel nut is knurled, the hand guard is a very snug fit to start with and the screw clamp it down around it, as simple as it seems it's a very solid setup.

View Quote View All Quotes

View All Quotes

Quote History

Quoted:

Quoted:
These look incredible.

What keeps it from twisting on the barrel nut?

Barrel nut is knurled, the hand guard is a very snug fit to start with and the screw clamp it down around it, as simple as it seems it's a very solid setup.

Bravo, CMMG. This new type of HG attachment is similar to (maybe licensed from?) Midwest Industries latest models. The real improvement of the CMMG version though is that it dispenses with notches, cogs or holes in the barrel nut for the gas tube. That allows the installer to tighten the barrel nut to optimum torque, then use the knurling on the exterior of the nut to clamp the HG tube onto. The gas tube always fits into its keyhole regardless of the final position of the barrel nut. No more need to apply excessive amounts of torque just to get to the next gas tube notch. I know from experience with MI's version of this type of clamp-on HG tube that it is rock solid. Accordingly, I trust CMMG's version will not twist out of alignment. - CW

Posted: 10/5/2013 2:32:35 PM EDT

[#38]

Will this fit over a piston system ?

Could you tell us what the length of barrel nut is?

Posted: 2/22/2014 3:40:03 AM EDT

[#39]

Any plans for a 10" model?

Posted: 2/22/2014 10:07:34 AM EDT

[#40]

Looks like very high quality. A little heavy compared to other offerings, but still nice.

Posted: 3/4/2014 10:12:01 PM EDT

[#41]

i got one of these for my 308 a month or so ago... it seems to work well, not too much flex and a good finish. only down side i see is that the barrel isnt exactly in the center of the rail where it exits, its sitting kind of lower 1/3 of the handguard. that might be common with 15" handguards, i dunno? doesnt really bother me... im happy with it!
http://i20.photobucket.com/albums/b229/revoqprs/20140114_140914_zpshta3qwic.jpg

Posted: 3/28/2014 8:31:32 PM EDT

[#42]

So I'm still confused. These do not fit current production DPMS LR-308 uppers with forward assist, only the older pre 2010 slightly higher railed version? Also it's been over half a year and still only 15" for the .308 version? Can we get some support for the current DPMS LR-308 platform please...

Posted: 4/4/2014 11:37:48 AM EDT

[#43]

I love my Keymod9 on my pistol. At first I was looking at the higher end rails, but my buddy at Black Rifle LLC talked me into giving this rail a try and it works great and is nicely priced!
http://i261.photobucket.com/albums/ii69/jeep_87_cherokee/969F1E19-9053-4A61-BDE4-BE033D999528.jpg