Eyy, why not

SPR love (with a rainier ultramatch):


Missing only a few pieces for a lightweight build with an 18" faxon gunner. Soon.

My Mk12 Mod 0 with a White Oak Armament SS 18" 1:7 SPR barrel




Battle Arms Development build with a LaRue Tactical 18" Stealth barrel

WOA 18" stainless bead blasted midlength barrel.



Lower has Spikes ST-T2 buffer and blue Sprinco buffer spring.  Recoil is very light with factory Federal 5.56 NATO.

Great choice for a new thread. Looking forward to this.

My 18"  tOBR.

Accuracy Evaluation of a Noveske 18” SPR Barrel







Noveske’s 18” SPR barrel is a stainless-steel barrel that has a medium contour and a 0.750” diameter gas block journal. The gas block journal for this barrel is designed for Noveske’s low profile gas block and the journal is only one inch in length; standard length gas blocks will not work with this barrel.  Fortunately, Noveske’s pinned and set-screwed low profile gas block is included with the barrel (as well as an intermediate length gas tube.)
















The Noveske SPR barrel employs an intermediate length gas system  which eliminates the short-stroke issues that are sometimes encountered in cold weather with some 18” barrels that utilize a rifle length gas system.  The barrel extension has “M4” feed-ramps. The barrel has a 1:7” twist rate and polygonal rifling (not a polygonal bore.)














The chamber found in this barrel is Noveske’s proprietary Noveske Match mod 0 chamber that “was developed to fire MK262 Mod 1 on AUTO in hot environments."  I installed the SPR barrel in a Colt M4 upper receiver and free-floated the barrel with a LaRue Tactical 12” handguard.











I conducted an accuracy (technically, precision) evaluation of the Noveske 18” SPR barrel 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 attached to the objective-bell of the scope. Wind conditions on the shooting range were continuously monitored using a Wind Probe. The set-up was very similar to that pictured below.














For this evaluation, I used one of my standard match-grade hand-loads topped with Sierra 55 grain BlitzKings.  When fired from my Krieger barreled AR-15s, this load has produced ½ MOA 10-shot groups at 100 yards.








Three, 10-shot groups were fired in a row from the Noveske SPR barrel from a distance of 100 yards with the resulting extreme spreads:

0.812”
0.732”
0.873”

for an average 10-shot group extreme spread of 0.81”.  The three, 10-shot groups were over-layed on each other using RSI Shooting Lab to form a 30-shot composite group.  The mean radius of the 30-shot composite group was 0.28”



The smallest 10-shot group . . .







The 30-shot composite group . . .





….


For the Internet Commando's in our viewing audience, here's a 3-shot group fired from the 18" Noveske barrel at a distance of 100 yards.  The group has an extreme spread of 0.189".












....


*  This barrel was purchased prior to J.N.'s passing.

killer thread

this is the rifle that made me fall in love with AR's. Built it from the ground up and its been through a few transitions . Its always reliable and dead on , it has a budget 1-6 scope but it does the job out to 600Y ....not really a grouper out there but it hits center mass out there all day . This was my first AR and still the smoothest rifle I've built or shot

was a 20" GI profile BCM cut to 18", i left the gas port alone and cycles perfect with m193 type ammo. mini phantom flash hider and southpaw friendly LWRC lower.

That's my missing even number between 10 and 20. I really ought to buy a 18" LaRue barrel while the sale is still going on.

YUSSSSSSSS


 

My only 18" right now.

Page 1 place holder?

Yes!



Thought I had more pics of an 18. Will need to take some.

Stick,

What is the upper of the first rifle you posted, nice looking rig.

Also what barrel is that?

Aero M5E1 18" barrel

mod juan

Bottom rifle:

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My Boy with my MA legal Wilson 18" Target crown Ace Skel stock NTD Lower CMT upper and SLR adj. gas blk and HG

 

I'll play.

So close to page ownage... Shoot. Oh well, not like I can do a proper link anyway.

Here's my gun that will eventually be rebuilt into a Mod 0.

Nice,  really like it, have a weight on that setup?

Some stuff I slapped together

I'm thinking about getting an 18" BCM 410SS upper and its main competition is a 16" 410SS upper, purpose of the rifle is Recce/DMR and I want to start shooting for groups and pushing distance some, do you really gain much velocity from the 18"? Does the rifle gas system make a big difference?
These 18" guns look really nice.

JP low mass kit with enhanced bolt, silent captured buffer spring, JP brake, adjustable gas. PRI 12" natural carbon fiber, noveske lower, vltor mur upper. Ssa-e, dpms mini sass Teflon coated fluted mid gas 18" tack driver, PRS stock. American defense recon, old Leupold tactical 3.5x10 with target turrets, Troy HK flip ups.

I personally wouldn't go shorter than 20".  I've spent quite a bit of time behind a 20" Larue, 2-18"s and 1-16" BCM SS410s over the past year and I honestly just don't like the 18"s.  An AR is hard enough to shoot already, the lighter 18" SPR type barrels don't do you any favors in the accuracy/ease of operation department.

I had my 18" BCM out last week and was having a time holding 1.5MOA at 100 yards testing some different loads.  Same exact ammo this morning in a 26" heavy bolt gun and it was like droppin' a dead cat off a bridge .7MOA consistently at 200 yards.  

I like the 20" barrels on an AR best.  24-26" heavy space gun type uppers feel too nose heavy to me and I would rather just shoot a bolt gun.  

The most recent addition:
SMOS SM-15 with Geissele G2S
Viper HS-T 6-24x50 (VHS-4310)
KAC URX3 Rifle Length
Colt slick-side BCG
PRI Gas block on Faxon rifle gas barrel
PWS/YHM QD Brake





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Noveske Gen1 lower with SSA
Anderson lightweight upper
KAC URX3.1 13.5"
Compass Lake Engineering 18" intermediate gas nitrided barrel
AIM Lightweight nickel boron BCG
B5 SOPMOD enhanced
KAC Taupe URX3 panels & grip
Vortex Razor HD-LH 3-15x42 HSR-4 reticle in a Vortex Warne CVP-1




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Gone but not forgotten:
S&W M&P10
LMT 2 stage FCG out of a MWS
MI 12" (DPMS low pattern)
Seekins adjustable gas block
B5 SOPMOD FDE
Noveske NSR FDE panels
YHM QD 308 brake
Black Rain CH latch installed
Viper VHS-4310 in CM-202 30mm cantilever mount




S&W Sport makeover
CMC 3.5lb flat bow trigger
Vltor A5 7 position RE
WOA rifle gas barrel, contoured and bead blasted
BCM KMR 13.5
YHM QD FH
Viper PST 1-4

I like my 18incher!





18 Inch Noveske LW Barrel, upper assembled by ADCO. More accurate than I am by far, but I'm working on it. Without the bi-pod it's 8lbs 13 oz, which I don't think is to shabby for what I use it for.

Please excuse the 20" in the back.

Man, good looking build! I know you haven't shot it a lot, but how are you liking that Proof Research barrel? I haven't seen too many of them on here, or anywhere really (for obvious reasons). I would like to pick one up some day, but what I have now does awesome, and too much other stuff to buy.

The only 18" AR that matters

Runner Runner built 18" with Diamondback 15" rail. Its for sale now, it just hasn't done it for me. Decided I'd rather focus on my A2 and A4 builds.

LaRue stealth 18"




 
 

Is that a 1-4 or 1-6?  Debating putting a strike eagle 1-6 on my A4 clone instead of the ACOG