Precision Rifle Build

[nightchief]

I wanted to build a .223/5.56 rifle capable of 1 MOA (100 yds) to 2 MOA (500 yards) for target shooting, varmint hunting, etc. The rifle is intended to be used mostly in the prone position and with optics only. I acquired the barrel a couple of years ago when LaRue Tactical was having a sale, so the build has bee evolving since. Lastly, I was inspired by Eurodriver's high wind shooting treatise as goal for the rifle (and the shooter).

Here are the specs:

Upper
• 18” LaRue Stealth SS barrel, mid-length gas system, Wylde chamber, 1:8 twist
• SureFire MB556K muzzle brake
• LaRue low profile gas block
• Geissele Mk 4 15” hand guard
• Vltor MUR upper receiver
• BCM bolt carrier group
• BCM Gunfighter Mod 4 charging handle

Lower
• Battle Arms Development forged lower
• BCM lower parts except for Battle Arms Development ambi selector and takedown pins
• LaRue MBT 2 stage trigger
• A5H2 buffer and Sprinco green action spring
• Magpul UBR G2 stock and A5/SR25 Receiver Extension

Accessories
• Nightforce SHV F1 4x14x50 Mil-R scope with LaRue SPR mount
• Harris bi-pod


I've got close to 1000 rounds through it so far, and it has been 100% reliable, running in temperature ranges between 23 degrees and 105 degrees. I've achieved 1.25 MOA at 100 yards and am consistently able (80%ish) to hit an 8" steel gong at 500 yards, in moderate wind, like 25 mph cross winds. A little better with light wind.

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[Rogue556]

That's a sweet rifle. I really dig the parts you chose for this build. I'm *almost* done with a similar 18" precision build myself and I went with a NF 2.5-10x32 but may eventually go with more magnification like yours. I did go with a 1st gen UBR on my build after impatience sunk in. Hopefully the 2nd gen is a large enough step up to warrant switching.

Have you had a chance to try the 69gr Black Hills TMK? Markm has a thread on it and it seems to do very well.

Sent from my SM-N910P using Tapatalk

[nightchief]

That's a sweet rifle. I really dig the parts you chose for this build. I'm *almost* done with a similar 18" precision build myself and I went with a NF 2.5-10x32 but may eventually go with more magnification like yours. I did go with a 1st gen UBR on my build after impatience sunk in. Hopefully the 2nd gen is a large enough step up to warrant switching.

Have you had a chance to try the 69gr Black Hills TMK? Markm has a thread on it and it seems to do very well.

Sent from my SM-N910P using Tapatalk

Thank you. The BAD lower is the nicest machined lower I have worked with. Nicer than the Colt, BCM and Seekins lowers I have.

I have tried the BH 69 and 77 TMK's...the results haven't been as good as the Hornady 75 gr OTM or BH 77gr OTM...I hijacked part of Markm'a thread regarding this "Problem"...
https://www.m4carbine.net/showthread.php?195044-Black-Hills-5-56mm-77-gr-TMK-and-69-gr-TMK-Review/page7
NC

[artoter]

Wow, I'm impressed! Beautiful rifle...but you got some green tied up into that one! :cool:

[nightchief]

Wow, I'm impressed! Beautiful rifle...but you got some green tied up into that one! :cool:

Thank you. I built it over time, so it wasn't "too" painful. Acquired some of the higher dollar items during various sales too.
NC

[556BlackRifle]

Nicely done nightchief! Have you tried any of the V-Max loadings? I have two Recce rifles and have seen similar results with SMKs and have been downright disappointed with the Black Hills loadings I've tried. I've been much happier with the V-Max out of both of these rifles. Even the light weight bullets seem to perform well through the 1:7 barrels.

[Hammer_Man]

Very nice. I'm starting to collect parts for a similar build. Hopefully it turns out as nice as yours. One question, what length gas system does the barrel have?

[nightchief]

Very nice. I'm starting to collect parts for a similar build. Hopefully it turns out as nice as yours. One question, what length gas system does the barrel have?

LaRue 18" barrel is a mid length gas system. If I was doing this rifle again, I would get a 20" rifle length barrel, such as a White Oak or Lothar Walther. The 18 runs fine, in fact perfectly so far, as I've had no malfunctions. It seems to be accurate with the right load. I rarely shoot it under 300 yards, really just to verify the zero, and would like to stretch it out to 800 yards. I think a 20" would be better.

[nightchief]

Nicely done nightchief! Have you tried any of the V-Max loadings? I have two Recce rifles and have seen similar results with SMKs and have been downright disappointed with the Black Hills loadings I've tried. I've been much happier with the V-Max out of both of these rifles. Even the light weight bullets seem to perform well through the 1:7 barrels.

I haven't tried any match loads under 68 grain. Outback 223 69 gr SMK shoots well from this barrel, and I like those account they're relatively inexpensive, though I've had trouble finding them lately. I should try v-max or blitzking 55 gr loads at some point just to see how they shoot. I rarely do anything with this rifle at less than 300 though, so I've leaned toward 69 gr and heavier for the distance stability.

[Cuda]

nice build

[nightchief]

nice build

Hey...thanks!

556BR: Gonna try some Outback (ADI) 55 gr Blitzkings and Hornady V-Max on Monday... will see how they do at 100 and 200 yards

[ShotgunMiddie]

That's a nice rig. I gave up on the UBR since it's like a unicorn. How do you like your LaRue trigger?

[AlphaTango23]

Great build!

[nightchief]

That's a nice rig. I gave up on the UBR since it's like a unicorn. How do you like your LaRue trigger?

Thank you.

It feels like the UBR is unobtanium, that's for sure! I like the SL-S stock though in the interim, and some day, that gen 2 UBR WILL come to market!

I really like the LaRue trigger for what it is. What I mean, is that it's a general purpose trigger that is decent for precision work. It's specs are similar to the G SSA, but to me, it feels closer to a G SSA-E trigger.

NC

[nightchief]

Great build!

Thanks!

[nightchief]

Finally!!!

46277

Oh yeah!!! First go with new stock and suppressor on Monday! Great way to enjoy the Independence Day holiday!

NC

[Hammer_Man]

Finally!!!

46271

Oh yeah!!! First go with new stock and suppressor on Monday! Great way to enjoy the Independence Day holiday!

NC

Your attachment is not working.. Btw do you have the old style MK4 rail with the set screws, or the new style with the tabs? I only ask because I want to swap out the KAC URX 3.1 I currently have mounted to my MUR for a Geissele MK4.

[nightchief]

Your attachment is not working.. Btw do you have the old style MK4 rail with the set screws, or the new style with the tabs? I only ask because I want to swap out the KAC URX 3.1 I currently have mounted to my MUR for a Geissele MK4.

Ok, not sure why the pic wasn't displaying, but I have re-loaded the picture...

My Mk4 has the hex screws on the tabs against the upper receiver...I had no fit issues with the MUR upper

NC

[nightchief]

Ran it today for the first time with the UBR G2 stock and suppressor. Love the stock! Definitely worth the wait. UBR feels lighter than the SL-S stock I was running previously. 30 uneventful, boringly reliable and accurate shots with Hornady 75gr OTM and BH 223 77 gr SMK on an 8" gong at 300 yards. Virtually automatic at this range. Conditions at 0800 were 83 degrees with 7 mph NE wind.

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I wanted to build a .223/5.56 rifle capable of 1 MOA (100 yds) to 2 MOA (500 yards) for target shooting, varmint hunting, etc. The rifle is intended to be used mostly in the prone position and with optics only. I acquired the barrel a couple of years ago when LaRue Tactical was having a sale, so the build has bee evolving since. Lastly, I was inspired by Eurodriver's high wind shooting treatise as goal for the rifle (and the shooter).

Here are the specs:

Upper
• 18” LaRue Stealth SS barrel, mid-length gas system, Wylde chamber, 1:8 twist
• SureFire MB556K muzzle brake
• LaRue low profile gas block
• Geissele Mk 4 15” hand guard
• Vltor MUR upper receiver
• BCM bolt carrier group
• BCM Gunfighter Mod 4 charging handle

Lower
• Battle Arms Development forged lower
• BCM lower parts except for Battle Arms Development ambi selector and takedown pins
• LaRue MBT 2 stage trigger
• A5H2 buffer and Sprinco green action spring
• Magpul UBR G2 stock and A5/SR25 Receiver Extension

Accessories
• Nightforce SHV F1 4x14x50 Mil-R scope with LaRue SPR mount
• Harris bi-pod


I've got close to 1000 rounds through it so far, and it has been 100% reliable, running in temperature ranges between 23 degrees and 105 degrees. I've achieved 1.25 MOA at 100 yards and am consistently able (80%ish) to hit an 8" steel gong at 500 yards, in moderate wind, like 25 mph cross winds. A little better with light wind.

4630146302

4518945190

[devinsdad]

First off, that's a helluva nice rifle you put together. I just ordered my UBR 2.0 this evening for something that's quite simular to your rifle. You stated you went with the A5H2 buffer. After reading so many threads about how over gassed the Stealth barrels are, did you try a -3 buffer or is the -2 plenty with the Sprinco green? These are my last parts needed (other than glass), been waiting on the new UBR for quite a while now.

[nightchief]

First off, that's a helluva nice rifle you put together. I just ordered my UBR 2.0 this evening for something that's quite simular to your rifle. You stated you went with the A5H2 buffer. After reading so many threads about how over gassed the Stealth barrels are, did you try a -3 buffer or is the -2 plenty with the Sprinco green? These are my last parts needed (other than glass), been waiting on the new UBR for quite a while now.

Thank you!

Unsuppressed, the rifle runs very well with a A5H2. Ejects consistently about 4 o'clock making a nice little brass pile. It ejects a little harder with the suppressor and might benefit from an A5H3 when suppressed. I noticed the ejection pattern being closer to 230 but still creating a nice pile of brass.

NC