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going to build an ar-10 and I've never built an ar10/15 before

long range newbie

Sergeant
Full Member
Minuteman
Apr 7, 2013
837
2
Oregon
So I have never shot or built an ar. I am getting an ar-10 lower from a friend and I am wondering what caliber, parts to use,( I will have a friend make a barrel for me) and maybe some tips on what to do and not to do.
 
308 for availability of parts and ammo. Did you get an actual armalite lower? or were you just saying ar-10? If you meant armalite then you have to get their bcg and barrel extension.. look for a matching upper

Dont mix and match parts it will lead to headaches. tryy to get as much as you can from one manufacturer.
 
first step might be find a friend that has one and shoot it and see if you even like it. Then look to see what you like/dotn like about the features of the gun. then look around at other peoples and compare and really find out what it is that you want from the gun and what parts will get you there. You shouldnt just build a gun because people on the internet said its good. Go find out what you like.
 
Research, research, research. Some of this stuff isn't the straightest scoop, so use your head picking and choosing among the multitude.

BTW, unless you have a better reason than ammo availability, reconsider .223/5.56, ammo is starting to come back.

Greg
 
You need to do a LOT of research/homework before you get much further into this mess as it can be daunting even if you know exactly what you want.

First and foremost...decide on which platform you want to build on. The primary options are Armalite pattern and DPMS/KAC pattern receivers/barrel extensions/bolts/carriers. Both are excellent platforms to build on but differ primarily in their magazines and some parts compatibility with their AR-15 little brothers. The DPMS/KAC pattern rifles have really taken off/over the last several years based primarily on the sheer multitude of different mfgs making uppers/lowers/aftermarket parts/accessories for them, and largely (thanks BARFCOM) to the introduction of magazines by Magpul that work on the DPMS-pattern rifles whereas with Armalite, the only company making mags for their rifles (the AR-10B rifles anyway) is Armalite. Both are excellent platforms to build all manner of large-frame ARs from...but only you can decide which is better for you and which particular mfg under which category makes the receiver with the features you have decided you want/need.

As for caliber selection...while .308/7.62x51 certainly passes the Two Dot test, is relatively cheap depending on what you feed it, and is capable of outstanding accuracy and performance within certain limitations, it may or may not be the best for you depending on your end goals with your rifle. Knowing more about what, specifically, you want/need out of the rifle in terms of max range, targets you'll be shooting (or game you'll be hunting with it), whether or not you reload (or plan on it at some point), etc., etc. would help this discussion along as there are dozens of different chamberings available for the large-frame ARs and they each have their own pros/cons.

Similarly, depending on which caliber you select and what your ends will be with the rifle should point you in the direction you'll want to go in terms of the barrel you select. While I know you said you have "a friend" who will make you a barrel, depending on how much money you'll pay said friend to make it for you, whether he has ever done an AR barrel and can properly set it up for you, etc. may be worth considering just buying a high-end, off-the-shelf barrel (there are MANY quality tubes out there for the large-frame ARs). The other thing to consider is sourcing a correct barrel extension for your build based on which platform (Armalite or DPMS) you select. Finding Armalite bbl extensions can be a PITA at times to put it mildly.

As for other "parts" to use...that just opens up a whole can of questions. First decide on how you want to proceed with the above questions...then focus on how best to achieve your goals from there. You'll need to select a specific pattern receiver before you start picking parts because for some things, you can NOT cross platforms in terms of compatibility. Thus, you'll need things like handguards/rails listed as being for DPMS (couple different generations of receiver/rail height) or Armalite and you can't use one on the other.

The other thing to consider when building any AR, whether an AR-15 or a large frame AR, is that it isn't something that can be done with your average hand tools in your basement/workshop. You'll need some specialty tools to properly put one together and they can get expensive if this will be a "one-time thing" for you in terms of building it. This is one of the reasons that many people outsource their builds or otherwise buy a factory rifle that is already setup in the exact (or close) configuration that they want. Just something to consider.

Anyway...food for thought for you before you get too far down this path of trying to figure out what is best for you. Once you decide on all that...we can probably better point you in the direction that will get you to where you want to be.
 
just providing us with in general what you want to do with it and your budget would helps us a lot in pointing you in the right direction.
 
First off, this is merely my opinion and perspective based on my experience and journey. When I decided to go down the path of building a semi-auto .30 cal, I quickly realized there were many questions that could only be answered with personal experience. Building or having a custom gun built can be a wonderful experience or costly disaster. I've had quite a bit of military arms experience 20 years ago, so I did have this knowledge as a foundation.

What I originally 'thought' I wanted for a large caliber gun was an M1A1. I also seriously considered building an AR-10, and though I'd have no problem building an AR-15, with the cost, my performance expectation, and lack of standards for large caliber, I decided against building an AR-10. After over a year of research, personal skill development/refreshing, and experimentation, what I wound up ordering was a custom built JP LRP-07

My suggestion would be to get (or build) an AR-15 to start, push that to its limit, and by the time you get there, you'll have a far better understanding of what you want out of a larger caliber gun. Stuff like: carbine or full-size rifle; desired effective distance, etc. having some experience will allow you to better choose size, optic, and have a general idea what you want out of the gun. Doing that on a 5.56 platform will build skill, save money, and you'll wind up also having an AR-15.
 
Never shot nor an AR15 or AR308 and starting a fresh build on the 308 platform ???

Maybe buy one first, get some experience then build one later???
 
Never shot nor an AR15 or AR308 and starting a fresh build on the 308 platform ???

Maybe buy one first, get some experience then build one later???

That sounds like a capital idea. Get some experience with the operation of the AR first. From experience I can say the first one is the hardest. I might add that I buggered the first one plenty and had do overs. Once you have done one its a lot easier and along the way you will have learned something about timing - headspace - lost springs etc etc. I have to admit I am one of those guys that won't read instructions until after I get stuck. Can't help it it's a guy thing.
Some day I will vacum up my shop and sift the dirt to find all those springs that flew away.