Since I can't find ff ras for a MK12 build. What's the next best thing.
Must be a quad rail

As outdated as the attachment to the upper receiver is, the LaRue quad-rail is still an excellent choice.




...

Centurion C4, BCM QRF, FCD RFH4, DD Ris II,

Beautiful rifle. Thank you I was leaning towards larue

I'm not saying it's better than anything but it's a solid rail
Attached File

I'd go with the Larue as well as an alternative.

RIS II

RIS II

QRF

+1 on Larue rail. Love mine.

I've built about a dozen uppers using the bcm rail, QRF MCMR KMR it's a excellent rail system. I can only find the fde QRF rail right now. The price is nice too.i want a black one though so when the rattle can wears off it's uniform

Sweet rig BTW!

RIS II

Depends how hard you wanna GWOT.

LaRue is pretty hard to beat in all areas except for getting clout on the gram.

How are centurion c4

I went with the C4 on my precision 20” hbar.

Great simple rail.
Its probably the lightest quad rail available

Centurions are great rails. I know it's not a cool, tier 1 manufacturer, but Midwest Industries, in my opinion, are every bit equal to the HSLD stuff. My life is easier and cheaper once I finally got over having to have the big name brands on my stuff. YMMV.

i mean PRI for mk12 cmon

Excellent.

I've got a few (FSB mid-cut and rifle lengths) and a Larue 12.0 quad.

I would be happy with either.

Molon,
I can't compliment you enough about this gun.  I've saved a picture of it on my desktop so I can "clone" it someday.

I just need a 13.2 to build off of.

I think the big trick to cloning that one may be figuring out the rear sling mount. Havent seen it done like that before. Several things going on in that area that would be challenging to work around. I have an idea or two about how it may have been done but would love to hear first hand.

Muchas gracias!  



Noveske 20” HBAR Accuracy Evaluation





This 20” barrel is one of Noveske’s 416R stainless steel, button rifled barrels. The exterior of the barrel has a bead-blasted finish.  Unlike most of Noveske’s other stainless-steel barrels, this barrel has an HBAR profile (not a medium contour profile.)  This barrel also differs from most of Noveske’s other stainless-steel barrels in that it has a standard length gas block journal (not a 1” gas block journal).  The gas block journal has a diameter of 0.750”.

The barrel extension has M4 feed-ramps and I paired this barrel with a LaRue upper receiver that also has M4 feed ramps.  The barrel was free-floated in a 13.2” Larue legacy picatinny handguard.





The chamber of this barrel is the original proprietary Noveske Match Mod 0 chamber designed by John Noveske.  The chamber “was developed to fire MK262 Mod 1 on AUTO in hot environments" and still produce better accuracy/precision than a 5.56mm NATO chamber.  The barrel stamp reads:

Noveske 5.56 NMm0 7PT




This barrel has a 1:7” twist and has shot every bullet weight from 40 grains to 77 grains quite well.  Unlike the Noveske cold hammer forged barrels that have traditional rifling, the Noveske stainless steel barrels utilize 5R polygonal rifling.





Gen 1 rifling . . .




Gen 2 rifling . . .




Accuracy/precision testing of this barrel was conducted after a 200 round break-in period.  All shooting was done from my bench-rest set-up following my usual protocol.  This accuracy evaluation used statistically significant shot-group sizes and every single shot in a fired group was included in the measurements. There was absolutely no use of any group reduction techniques (e.g. fliers, target movement, Butterfly Shots).

The shooting set-up will be described in detail below. As many of the significant variables as was practicable were controlled for. Pictures of shot-groups are posted for documentation.

All shooting was conducted from a concrete bench-rest from a distance of 100 yards (confirmed with a laser rangefinder.) The free-float hand-guard of the rifle rested in a Sinclair Windage Benchrest, while the stock of the rifle rested in a Protektor bunny-ear rear bag. Sighting was accomplished via a Leupold VARI-X III set at 25X magnification and adjusted to be parallax-free at 100 yards. A mirage shade was used. Wind conditions on the shooting range were continuously monitored using a Wind Probe. The set-up was very similar to that pictured below.





The Wind Probe . . .



I developed a hand-load for this barrel using the Sierra 55 grain BlitzKing.  I used my Accuracy Node Detection Technique to develop this load.


WARNING!

Reloadi­ng is an inherently dangerous activity. The information provided here is for educational purposes only. It is not intended to be used for the actual loading of ammunition by the reader. No warranty, guarantee or assurance that these loads are safe is stated, suggested or implied nor should any be inferred. Usage of this information for the actual loading of ammunition may result in malfunctions, damage and destruction of property and grave injury or death to beings human in nature or otherwise. Don't even view this information in the presence of children or small animals.

As mentioned above, the projectile used for this example was the Sierra 55 grain BlitzKing and the powder used was VihtaVuori N133. The following eight powder charges were used:


Target #1 - 24.0 grains

Target #2 – 24.2 grains

Target #3 – 24.4 grains

Target #4 – 24.6 grains

Target #5 – 24.8 grains

Target #6 – 25.0 grains

Target #7 – 25.2 grains

Target #8 – 25.4 grains





VihtaVuori N133




Testing was conducted at a distance of 100 yards.  Eight 5-shot groups were fired in a round-robin manner to obtain six sets of three consecutive targets. These six sets of three consecutive targets were over-layed on each other using the On Target TDS software program to form six 15-shot composite groups and the mean radius was used to find the accuracy node. The results are shown in the graphics below.





Groups #5, #6 and #7 over-layed . . .





To reiterate, the 15-shot composite group pictured above was fired in a round robin manner with rounds charged with three different powder charges.  The extreme spread for the 15-shot composite group was 0.88 MOA.  The middle powder charge for the 15-shot composite group was 25.0 grains.

An individual 10-shot group loaded with the nominal powder charge of 25.0 grains had an extreme spread of 0.74”.





Five 10-shot groups of the 55 grain BlitzKing loaded with the nominal powder charge of 25.0 grains fired in a row from the 20” Noveske barrel at a distance of 100 yards were overlayed using RSI Shooting Lab to form a 50-shot composite group. The mean radius for the 50-shot composite group was 0.28”.





Lastly, for any Internet Commandos in our viewing audience today, here’s a pic of a sub ¼ MOA group fired from the 20” Noveske barrel at 100 yards.  The group has an extreme spread of 0.175”.







..

Thanks Molon for sharing. I like the 13.2 rail and since it wouldnt be a true clone I am going to build a precision rifle with a 18 barrel and the 13.2 rail. I have shot 18s with rifle gas like how smooth and accurate they are. I can put more money into performance parts then clone correct parts like a ops brake and collar that I don't have a can for.

The LaRue is an improved copy of the KAC.

I haven’t seen one in a long time but I still think they’re the best handguard ever made.

I love my Larue quad.

DD Omega 7 Picatinny is better.

RIS II

BCM QRF if you’re weight conscious.

Larue 12.0 -- though they've been scarce and on back-order for quite a while.

BCM QRF-12 would be second, and probably easier to source.

I have both.  The Larue's profile is thinner, side-to-side.

Thanks for the info I prefer a thinner profile I've had QRFs before there great but can't find and would like something different

There's a few different F1 manufacturers that make adapters so you can use your 1.375" x 24 can on your MK12s OPS/AE mounting system if you ever choose to. Just an FYI.

There's also Midwest, but I don't have personal experience with the 5.56 rail:

Geissele MK7 or DD

I found a DDM4 12 rail on the EE so will see how it works. Ordered a BA 18 spr barrel with pinned gas block since wont be a MK12 clone more of inspired SPR wich is fine with me. Will look something like this Attached File

Just ordered a carbine tube assembly and b5 stock for my spr lol.

I picked up a 12.0 off GB a few months ago.

It was the first Larue HG I'D ever bought and my objective with it was to make a "clone" of my first AR which was a LMT 16" with a certain unnamed MFG rifle length quad.

The original gun was a carbine gas FSB barrel and I changed that to become a pinned LPGB.

This time I put a Centurion LW mid-gas barrel in under the LT 12.0 and all I lack for it is an optic.

I'm due for a range trip

I saw LaRue 12” quads in stock a few weeks ago so I grabbed one but haven’t been home yet to play with it. Anyone that has one, is it a true 12”? Going to be using it as a place holder for a NSW Recce until KAC FF Ras longs come back (if?) and was hoping it’d actually be closer to 12.25”

I love the DD Omega 7 and run one on my HD carbine.

But, a Mk12 needs a 12 inch rail.

Solid choice.  If you cant fine KAC and dont want Gieselle then DD is the best bet IMHO.  Have one on a Mark 18 upper and a M4A1 FSB upper.  Very happy with them.

Topic Moved

Larue quad rails are great. The anti-rotation feature is a big plus.

I'd be building if BA would get my barrel on the way Attached File


Got some paint done and mocked used for now.
Attached File

Nice. I'm going to do some painting once my new scope comes in.
Attached File

@03RN
I like the  tube setup. What scope you have. I just got LT139 SPR-E 30mm and need some glass now.

That's a 4x Leupold there. I'm waiting on a 2.5-10x44 vortex PST
$329

I had same vortex awesome scope for 300 bucks.  I've been thinking about getting another

I need some more paint.

Attached File

I've been digging the rustoleum sand with aervoe coyote highlights

Got it together today and going to test fire tomorrow. I want a nice trigger and muzzle brake. The scope is of my 308 a bit large and heavy for this. I might just put a PST 1-6 on it. I will paint the optic once I settle on it. Attached File

Looks nice.

Took mine out to 200 today
Attached File

Thanks yours turned out great too.
How do you like PST. I miss my gen 1s way lighter. FFP is overrated in my book for small frame 5.56 guns. I honestly might  buy a PST 1-6

If anyone cares the BCM rails I feel ar nicer and easier to install than the DD. Faster too. And DD barrel nut wrench sucks.