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LR 308 is finally done

JayJay Senior MemberNew Mexico/TexasPosts: 4,550 Senior Member
In my other thread, I went over the plan for this build and sought some advice. I got good advice and have been picking up parts here and there. Everything finally came in and the gun is finished. Here’s the link to the other thread. 
https://forums.gunsandammo.com/discussion/36676/308-win-ar-build-thoughts/p1

And heres a pic of the finished gun. In my next post, I’ll give a general list of the parts used.

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Replies

  • JayJay Senior Member New Mexico/TexasPosts: 4,550 Senior Member
    Parts list;

    Aero Precision upper and lower receivers and bolt carrier group 
    Ground Zero Precision “Ballistic Advantage” 16” barrel, 1:10 twist
    SLR adjustable gas block
    AR Stoner muzzle brake
    Vortex Strike Eagle 1-6x24 scope and Vortex cantilever mount
    LaRue Tactical MBT trigger - 2.5lb first stage, 2lb second stage 
    Hogue 15 degree grip
    DPMS A2 stock
    Trinity Force 15.5” handguard. 
  • ZeeZee Senior Member Posts: 28,069 Senior Member
    Well done!
    "To Hell with efficiency, it's performance we want!" - Elmer Keith
  • Diver43Diver43 Senior Member Between Ft Lauderdale and MiamiPosts: 12,561 Senior Member
    I like it, that gun should serve you well. 
    Logistics cannot win a war, but its absence or inadequacy can cause defeat. FM100-5
  • JayhawkerJayhawker Moderator Manistee Natl ForestPosts: 18,289 Senior Member
    That will work...nicely done...
    Sharps Model 1874 - "The rifle that made the west safe for Winchester"
  • LinefinderLinefinder Moderator Colorado SpringsPosts: 7,823 Senior Member
    Nice!!!
    "Walking away seems to be a lost art form."
    N454casull
  • JKPJKP Senior Member North FloridaPosts: 2,678 Senior Member
    Looks great and good parts selection. 
  • JayJay Senior Member New Mexico/TexasPosts: 4,550 Senior Member
    Thanks guys. 

    I was able to get it out to the range briefly today. The only ammo I had on hand was some factory 150 grain Winchester Super X. All the hand loads I have are for the Weatherby and Savage and are too long for this gun. But, this was mainly to get the scope at least close to dialed in and function check the gun. After getting the scope in the ballpark, I had 6 rounds left. Fired two three round groups at 100 yards. The gun is not a fan of this ammo and/or the trigger nut was broken. I didn’t measure the groups, as it wasn’t really impressive and not the ammo I plan to use in this thing. But I’d say just over 2” first group and just over 1” second group. I’ll clean the barrel up and load some test loads for it. I have a few hundred 168 grain Amaxs here to play with and try to get those groups shrunk down. 

    On the plus side, the gun functioned flawlessly. Fired every round, no malfunctions. The muzzle brake works extremely well. Very little recoil and the gun comes straight back on recoil. I wasn’t holding onto it and it never came up at all. Left hand holding the rear bag, all fingers on the right hand on the right side of the gun, slight pressure back into my shoulder and focus on fundamentals. I got a video of a 3 round string. Can’t post, as I don’t do YouTube.  This gun recoiled about as much as my 243 bolt gun and it doesn’t come up off the bag at all. 

    Im unsure of how to tune the gas block at this point. It is 15 position adjustable. I simply closed it all the way, then opened it 7 clicks. Almost half open, iow. It was leaving the brass in a pile about 2 feet away, my 3-4 o’clock. When I find a load it likes, I’ll finish dialing it in. I’ll need at least a 5” long Allen wrench to reach the adjustment screw from the front of the handguard. 
  • Elk creekElk creek Senior Member Colorado!Posts: 7,711 Senior Member
    Very cool! Nice work!
    Aim higher, or get a bigger gun.
  • JayJay Senior Member New Mexico/TexasPosts: 4,550 Senior Member
    Oh, and I gotta remember something about that scope, too. 

    I fired the first round at 25 yards, just to get on paper. 4” low, 4” left. Cool.  A bunch of clicks later, 4” high, 4” right...  Scratch head.... How did I go double what I was supposed to go???

    1/2 moa clicks on this scope.... :open_mouth:
  • CHIRO1989CHIRO1989 Senior Member Central MNPosts: 14,663 Senior Member
    Nice AR-10:)
    I take no pleasure in the death of the wicked, but rather that they turn away from their ways and live. Eze 33:11
  • North ForestNorth Forest Member Maple Falls, WA.Posts: 358 Member
    I'm using the same scope and mount on my new FAL and am getting good results. Really like it so far.
  • Farm Boy DeuceFarm Boy Deuce Senior Member Posts: 6,083 Senior Member
    That came out great Jay. It sounds like you have the gas block pretty close to tuned. 
    When I tuned my gas block I started at maybe five clicks open and fired a couple shots, open a click. When I got far enough that the rifle cycled reliably I went one more click, just for luck. 
    I am afraid we forget sometime that the basic and simple things brings us the most pleasure.
    Dad 5-31-13
  • JayJay Senior Member New Mexico/TexasPosts: 4,550 Senior Member
    I'm using the same scope and mount on my new FAL and am getting good results. Really like it so far.
    I like it so far as well.  Time will tell.  It is pretty bright and clear and the reticle is very nice and crisp.  No problems aiming at 1" pasters at 100 yards with it on 6x.  I just have to remember it's a 1/2 moa adjustment scope.  I knew that before.  But I've spent so much time on 1/4 moa, my brain instantly registered 32 clicks to move 4" at 25 yards.  I moved 8"....
  • JayJay Senior Member New Mexico/TexasPosts: 4,550 Senior Member
    That came out great Jay. It sounds like you have the gas block pretty close to tuned. 
    When I tuned my gas block I started at maybe five clicks open and fired a couple shots, open a click. When I got far enough that the rifle cycled reliably I went one more click, just for luck. 
    Thanks.  I think I'm at least in the ballpark with it.  I didn't bother tuning it any further until I get a load worked up for it and see how it does.  I might close it down a click at a time until I get a malfunction, then open it back up a couple of clicks and make sure it functions 100%. 
  • JayJay Senior Member New Mexico/TexasPosts: 4,550 Senior Member
    Thanks for the compliments, guys.  I'm happy with this thing so far.  After firing just 12 rounds out of it yesterday, this thing can easily become one of my favorites.  Easy recoil, no muzzle rise, appears to have some accuracy potential and the scope works very well on it.  I'll be adding a sling to it to make it easier to carry.  It is a bit on the heavy side.  I don't have a scale to get a weight on it.  It's not nearly as heavy as my X-Sight AR15, but a bit heavier than my medium weight AR15.  Just for kicks, I'll get all three of them out tonight and take a pic of the sisters with their big brother.
  • shootbrownelkshootbrownelk Senior Member WyomingPosts: 2,035 Senior Member
    Nice AR-10.  Maybe I missed it, but how much does yours weigh?
  • JayJay Senior Member New Mexico/TexasPosts: 4,550 Senior Member
    Nice AR-10.  Maybe I missed it, but how much does yours weigh?
    I'm not sure.  I don't have a scale at home or a way to weight it.  I'll have to figure out a way.  My guess would be somewhere around 10 pounds, more or less.
  • ZeeZee Senior Member Posts: 28,069 Senior Member
    edited August 2018 #19
    "To Hell with efficiency, it's performance we want!" - Elmer Keith
  • JayJay Senior Member New Mexico/TexasPosts: 4,550 Senior Member
    Zee said:
    Have you ordered it yet?  That looks like a darn good deal for that upper.  Only thing I can see it would need is an adjustable gas block swapped for the non adjustable that's on it.  Other than that, it looks very much like the one I just built.  Mine is also the SOCOM profile and that brake looks exactly like the AR Stoner I put on mine and really like so far.
  • Farm Boy DeuceFarm Boy Deuce Senior Member Posts: 6,083 Senior Member
    Zee said:
    They have some seriously good prices. Maybe I need a 16” to go with my 24” upper. 
    I am afraid we forget sometime that the basic and simple things brings us the most pleasure.
    Dad 5-31-13
  • Diver43Diver43 Senior Member Between Ft Lauderdale and MiamiPosts: 12,561 Senior Member
    Jay said:
    Zee said:
    Have you ordered it yet?  That looks like a darn good deal for that upper.  Only thing I can see it would need is an adjustable gas block swapped for the non adjustable that's on it.  Other than that, it looks very much like the one I just built.  Mine is also the SOCOM profile and that brake looks exactly like the AR Stoner I put on mine and really like so far.
    Why would you change the gas block if the gun functions properly with the one on it?  Suppressed loads?
    Logistics cannot win a war, but its absence or inadequacy can cause defeat. FM100-5
  • JayJay Senior Member New Mexico/TexasPosts: 4,550 Senior Member
    Diver43 said:

    Why would you change the gas block if the gun functions properly with the one on it?  Suppressed loads?
    308 gas guns tend to be over-gassed and as a result, have a tendency to beat themselves to death.  An adjustable gas block is just good insurance, allowing the user to tune for just the required amount of gas to the BCG to do the job.
  • JayJay Senior Member New Mexico/TexasPosts: 4,550 Senior Member
    In other words, I'm sure the gun can function just fine with the gas block that's on it.  But how long will it last if the BCG is beating the crap out of the gun every time it fires?
  • Diver43Diver43 Senior Member Between Ft Lauderdale and MiamiPosts: 12,561 Senior Member
    GOT CHA   , that makes a lot of sense, especially with a .308
    Logistics cannot win a war, but its absence or inadequacy can cause defeat. FM100-5
  • JayJay Senior Member New Mexico/TexasPosts: 4,550 Senior Member
  • JKPJKP Senior Member North FloridaPosts: 2,678 Senior Member
    Zee said:
    They have some seriously good prices. Maybe I need a 16” to go with my 24” upper. 
    Add $100 for a decent BCG. Still good pricing. 
  • JayJay Senior Member New Mexico/TexasPosts: 4,550 Senior Member
    JKP said:

    They have some seriously good prices. Maybe I need a 16” to go with my 24” upper. 
    Add $100 for a decent BCG. Still good pricing. 
    Heck, I'd just double check head spacing using the BCG from the existing upper and swap it back and forth between the two uppers.  Can only use one upper at a time, with just one lower...
  • JayJay Senior Member New Mexico/TexasPosts: 4,550 Senior Member
    edited August 2018 #29
    A couple of days ago I loaded some test loads for the 308. After getting some advice in my thread about gas gun loads and consulting my Hornady manual, I came up with 40.5, 41, 41.5 and 42 grains of H4895. I got out this morning before the heat got too bad and tried them. The gun did ok with the 40.5 grain loads. The hole to the left was my third and I felt like I pulled it just a touch before I saw it on the board  I think that one could have been a little better. I didn’t take my caliper with me, but comparing it to the 1” paster, it looks to me like it’s pretty close to 1” even with the flier.

    The next two loads opened up pretty dramatically. I won’t even bother posting pics. 2”+ groups. It definitely didn’t like those loads. I had a feeling it would find another accurate spot somewhere higher and was hoping the 42 grain load would be it. I wasn’t disappointed. 


    I cut that section of the target backer out and out and took it home to measure it. .49” center to center. Thats at 2.175” BTO length. I’ll take that. Now, I need to load up the rest of my brass with that load and check velocity next time out. Then I can get my initial ranges on the BDC reticle marks and verify them. 
  • ZeeZee Senior Member Posts: 28,069 Senior Member
    edited August 2018 #30
    Jay said:

    308 gas guns tend to be over-gassed and as a result, have a tendency to beat themselves to death.  An adjustable gas block is just good insurance, allowing the user to tune for just the required amount of gas to the BCG to do the job.
    This
    "To Hell with efficiency, it's performance we want!" - Elmer Keith
  • ZeeZee Senior Member Posts: 28,069 Senior Member
    edited August 2018 #31
    Jay said:
    JKP said:
    Add $100 for a decent BCG. Still good pricing. 
    Heck, I'd just double check head spacing using the BCG from the existing upper and swap it back and forth between the two uppers.  Can only use one upper at a time, with just one lower...

    "To Hell with efficiency, it's performance we want!" - Elmer Keith
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