first AR build advice?

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  • stead
    Unwashed
    • Oct 2018
    • 8

    first AR build advice?

    I've been shooting and reloading 6.5 Grendel for about a year with a CZ 527 bolt action rifle. The cartridge meets all my expectations and I'm thinking about acquiring more rifles in the chambering, particularly AR-15's. I don't have any AR-15's now in Grendel or any other chambering. I have shot them and I'm familiar with the action but not so much with the current vendor landscape.

    I'm going to be looking for a good deal on several stripped lowers, and I will build one of them for this year and the others in years to come. The build I want to complete first will be 6.5 Grendel and I hope to make it a very good rifle indeed from a practical standpoint, without excessive expense. I don't have the standard AR armorer's tools, but other than the expense of acquiring them I'm not intimidated by the build process.

    I suppose with respect to Grendel in particular, my questions are mostly about the barrel, BCG, and magazines. Is there really anything else that's Grendel-specific?

    For the barrel and BCG, I think I want Odinworks. I know the barrel is probably the most critical component to accuracy. I know there are cheaper barrels from PSA and BCA, but is there a high-end barrel I should be considering instead? AA maybe? From what I know so far, I'm leaning toward an Odin complete billet upper with a 20" barrel and MLOK forend. I like the FA delete and I figure their gas block and BCG are all good choices so I'll save myself some tools and buy it complete.

    This first build will probably be a 20" bbl with rifle-length gas system. I want to use it for deer, antelope and predators besides some of the "carbine" training classes. I want to do a top-shelf pistol build in the future but I'm concerned the short barrel, gas system and low weight will result in loud blast, concussion, recoil and quite a handful.

    I read someone recommend the Stoner magazines, so maybe I'd get some of those. I figure I'll eventually own about 10 for Grendel and I'd like them to be both good and consistent, so I'm open to further advice.

    Beyond the Grendel-specific stuff:

    For the lower(s), I'm leaning toward billet for light weight. I figure $250 for a billet lower is worth the weight saved. I'm not looking to spend extravagantly beyond that because for me a forged Aero or Anderson lower would probably be fine. So what's a good billet lower for the money? BAD?

    I'd probably finish the lower with a Magpul STR build kit from PSA, but substitute a Geiselle SSA trigger. I need a safe trigger for training classes, home defense, and contingencies besides hunting. I figure beyond the barrel, the trigger is probably the next most important for precision. I know there are drop-ins and single-stage triggers that could be better for precision work, but I need a good all-purpose trigger.

    For the optic, probably the EO Tech XPS2 and for hunting a Leupold VX-R.

    Without the optics, I'm figuring it will be a little over $1500. The only ways I can see to save some money is to use a forged lower, assemble the upper myself in which case I'd have more expense for tools, or to use a cheaper barrel or trigger which might not really meet my goal.
  • A5BLASTER
    Chieftain
    • Mar 2015
    • 6192

    #2
    Me personally this is what I would do.

    Buy the best tools I could afford and build it myself. Reason being, down the road if you need too change something out or repair it somehow. Your going too need those tools.

    Building it yourself will help you understand how everything works together and will help teach you what too check first when a issue pop's up.

    Ok on the parts list. Forget the billet lower. Save case and get a forged lower. Not sure a billet lower is lighter in weight then a forged lower.

    Trigger you could go with a Larue mbt and safe some cash over the ssa and still have a great all around trigger.

    Lower parts kit, Anderson is just fine

    Barrel/bolt, I would look at what PF has over odion. We have bolts for sale in the group buy section of this fourm.

    BCG, is standard so you can get a cheap stripped bcg of your choosing and the fireing pin, retaing pin, cam pin from online for cheap.

    The rest of the parts is very personal preference so I won't say much on what you should look at. I will say this as far as handguards go. Get one that is not only free floating but is also a non indexing design meaning the barrel nut doest have the gas tube passing throw it.

    Hope this helps sir.

    Comment

    • grayfox
      Chieftain
      • Jan 2017
      • 4549

      #3
      yeah, the 250 for a billet lower is not what I would do either. Get a good forged lower, BCM comes to mind, or aero, or spikes. Look on joebob for some choices. Lots of good ones for the money, figure about $100 give or take. On the trigger, yes the MBT is a good one, sometimes there is a wait list, or timney 2.5# right off, maybe CMC... with the savings on that lower you can afford to get timney if you need to. I don't assemble any upper receivers, the assembled ones suit me fine. I do build most of the rest of my uppers however, again not very difficult, not many required tools, just mechanical aptitude. Your upper sounds ok.
      Watch out on the carbine buffer tube/stock combo's, there are 2 sizes of buffer diameter, commercial or milspec -- I personally don't care which one you choose but they have to match each other. both do the job fine. For a buttstock I'd think of the Magpul CTR or similar, it's adjustable strong and light.
      Building an AR is not hard, just take your time and have some written instructions in front of you, there are plenty of how-to's on the net.

      Never go "cheap barrel", cheap trigger or "cheap glass" -- none of these will work out and none of them are really cheap. The barrel is the gun. Trigger and glass are right up there. There are several value-oriented but quality parts in barrels, triggers and glass however. They are usually mid-price but worth it. For a bit more money you can get a Criterion barrel (like from precision firearms) but for starters Odin (or ballistic advantage, fluted - what I do for this range of build) are good choices. We also have group buys on barrels and bolts under the Equipment exchange section... good buys definitely.

      For the BCG get a good on-sale 556 bcg nitrided or nickel boron and get the group buy bolt from on here, save the 556 bolt for a later use in AR-223/556. I wouldn't get the "on-sale" grendel bcg's b/c most of them are Toolcraft and the TC's may have differing bolt/firing pin length specs that can mess you up. Doing the "556 and swap routine+bolt from the group buy" avoids all of that and you still save some coin.
      "Down the floor, out the door, Go Brandon Go!!!!!"

      Comment

      • stead
        Unwashed
        • Oct 2018
        • 8

        #4
        So for barrels, Odin? Rainier? BSF? Faxon? Satern (Brownells)? Kreiger? Lilja? Criterion? I'm just looking for top-notch 416R - no carbon wrap, and lightweight or medium weight, probably .7-something at the muzzle, not a .9xx heavy bull barrel
        Last edited by stead; 05-18-2019, 06:34 PM.

        Comment

        • Gusmeister
          Warrior
          • May 2017
          • 162

          #5
          You speak from the innocent side of building AR's. Once you build a few you become addicted. A true junkie and you'll end up trying all sorts of parts from all sorts of manufacturers. Your innocence will pass while your mastery of AR building takes over.

          That said... My Grendel has an Odin Works 20" SS barrel, BCG and gas system. Shoots great. Very accurate. While there are a lot of choices, this will always be one of the best. However.... if Aero Precision was making Grendel barrels 2 years ago I would probably have gone with everything but the trigger from them. I've used a lot of their stuff and have come to respect them for great value at good prices. I am not a target shooter though my 18" nitrided 5.56 4150 carbon steel barrel spits out .7moa groups all day out to 500 yards when the wind is down.

          Most of my AR's now have LaRue triggers. Do yourself a giant favor. Along with the normal armorers tools (including a vice block).... PLEASE get some roll pin starter punches and regular roll pin punches. With these and a vice block it will be like having 4 hands.

          Have fun.

          Comment

          • HickLife
            Bloodstained
            • Dec 2018
            • 67

            #6
            Aero is my go to for receivers. Their not overly expensive (on big daddy unlimited right now you can get a matched upper and lower for 95 bucks) and they are very well made IMO. If there are weight savings with a billet lower it isn't much, and since you are concerned with recoil (mostly with the pistol but still) having a slightly heavier gun could help with that. I'm not a trigger snob either, mil-spec trigger is all you need in my opinion, bravo company's PNT is a decent one. Save the money where you can and put that into the barrel/optics/ammo. Pretty much all the barrels you mentioned are good, the brownells one is cheap (I have a 24" one that does .5" groups with hornady black), and look at the group buys on here to get a good deal on some really good ones.

            Comment

            • A5BLASTER
              Chieftain
              • Mar 2015
              • 6192

              #7
              Originally posted by HickLife View Post
              Aero is my go to for receivers. Their not overly expensive (on big daddy unlimited right now you can get a matched upper and lower for 95 bucks) and they are very well made IMO. If there are weight savings with a billet lower it isn't much, and since you are concerned with recoil (mostly with the pistol but still) having a slightly heavier gun could help with that. I'm not a trigger snob either, mil-spec trigger is all you need in my opinion, bravo company's PNT is a decent one. Save the money where you can and put that into the barrel/optics/ammo. Pretty much all the barrels you mentioned are good, the brownells one is cheap (I have a 24" one that does .5" groups with hornady black), and look at the group buys on here to get a good deal on some really good ones.
              The brownells and Saturn barrels aren't grendels either.

              Comment

              • BCHunter
                Warrior
                • Jan 2018
                • 555

                #8
                If your budgeting 1500 for the build, I would also go with a forged lower and upper vs billet, and spend the savings on the barrel and assemble myself. Bartlein, lija, criterion, proof research, or look at what precision firearms offers for drop in barrels.
                But if your set on billeted the Odin will do just fine.
                I have an 18" Odin barrel i assembled myself with rest of the upper aero precisoon parts, I have around 700 in to it and does everything I need .

                Comment

                • grayfox
                  Chieftain
                  • Jan 2017
                  • 4549

                  #9
                  Originally posted by stead View Post
                  So for barrels, Odin? Rainier? BSF? Faxon? Satern (Brownells)? Kreiger? Lilja? Criterion? I'm just looking for top-notch 416R - no carbon wrap, and lightweight or medium weight, probably .7-something at the muzzle, not a .9xx heavy bull barrel
                  If you're now saying top-notch barrel, then by all means Bartlein Krieger or the Lilja, Lilja has a model 720 and 740 models IIRC that is .07-ish at the muzzle. Next tier down is probably the Criterion, then BA and Odin and maybe a few others. This is all my opinion I'm sure there are others here that have more expertise. Your costs will go up if you go for one of those top 3 but barrel-wise you won't be sorry I'm sure.
                  "Down the floor, out the door, Go Brandon Go!!!!!"

                  Comment

                  • HickLife
                    Bloodstained
                    • Dec 2018
                    • 67

                    #10
                    I'm confused... What do you mean they aren't grendels?

                    Comment

                    • Bigs28
                      Chieftain
                      • Feb 2016
                      • 1786

                      #11
                      If your budget is 1500 look at the larue kits.

                      Comment

                      • A5BLASTER
                        Chieftain
                        • Mar 2015
                        • 6192

                        #12
                        Originally posted by HickLife View Post
                        I'm confused... What do you mean they aren't grendels?
                        They are not the sammi chamber. I.e. it has a wildcat chamber.

                        Nothing wrong with that if that's what you want.

                        Comment

                        • grayfox
                          Chieftain
                          • Jan 2017
                          • 4549

                          #13
                          Brownell and Satern might be the "264 lbc" style chamber, not a Saami Grendel. The Saami is your best bet as far as I'm concerned.
                          "Down the floor, out the door, Go Brandon Go!!!!!"

                          Comment

                          • HickLife
                            Bloodstained
                            • Dec 2018
                            • 67

                            #14
                            Oooooh ok, I didn't realize that. I'm getting great results from it though so I'm not complaining.

                            Comment

                            • AZHTfreak
                              Warrior
                              • Jan 2017
                              • 316

                              #15
                              Originally posted by Bigs28 View Post
                              If your budget is 1500 look at the larue kits.
                              ++1 this, if you are patient and can deal with the probable long lead time...
                              DOJ+FBI+IRS+AFT=NKVD. Joe Stalin and Lavrentiy Pavlovich Beria are tap dancing in hell right now...

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