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Posted: 6/12/2015 11:57:44 AM EDT
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Ok, I'm man enough to admit when I'm out of my depth. I've finished 80% AR 15 receivers before and as a matter of a fact I have a nice AR Pistol. So I thought to myself, "how much harder could it be to do an AR 10?" and then the questions start.
I bought the 80% receiver at a gun show thinking that, like an AR 15 one was pretty much the same as another. So I did all of the drilling and milling and now have a completed stripped AR 10 receiver. So I start to gather the parts to finish it. This is where I start thinking that maybe it won't be as simple as an AR 15. It seems that in most instances most AR 15 lower parts will fit most receivers (but not always). To avoid any problems I purchased an AR 10 lower parts kit (minus fire control group). I haven't received it yet so to kill some time I start looking to decide what kind of AR 10 upper I want/can afford. Now I'm stumped. It appears that there are at least 3 different pattern AR 10s. DPMS, Armalite, and I forget the third. How do I know what one I have? What happens if I can't figure it out and I guess wrong? Am I correct that an AR 10 lower parts kit purchased from a reputable supplier will fit no matter which type of lower I have? What about magazines. I've seen some references that seem to indicate that there is even more than one type of magazine, does that mean that some lowers won't take some magazines? Any information you all could provide me would be most appreciated. |
| Hardly an expert here, but AR10's are what I got into first and then only last year. Yes, there is little full compatibility among many of the .308 (and similar) manufacturers. Buttstocks, grips, and some other hardware are usually the only items that crossfit and that is usually only because they are able to use AR15 items. The main issue is that there is no "milspec" .308 AR platform. It seems that the SR25 (also often referred to as DPMS pattern) pattern is the most common, but even DPMS has veered from some of that with their GenII pattern rifles. On magazines this is becoming more common to use SR25 style mags. Even Armalite is now making most of their rifles with this mag standard. Still, on a lot of the other components you have to be careful in parts selection and compatibility. There are doable component selection avenues one can take, but either study up some or get knowledgeable advice. |
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Quoted:
Ok, I'm man enough to admit when I'm out of my depth. I've finished 80% AR 15 receivers before and as a matter of a fact I have a nice AR Pistol. So I thought to myself, "how much harder could it be to do an AR 10?" and then the questions start. I bought the 80% receiver at a gun show thinking that, like an AR 15 one was pretty much the same as another. So I did all of the drilling and milling and now have a completed stripped AR 10 receiver. So I start to gather the parts to finish it. This is where I start thinking that maybe it won't be as simple as an AR 15. It seems that in most instances most AR 15 lower parts will fit most receivers (but not always). To avoid any problems I purchased an AR 10 lower parts kit (minus fire control group). I haven't received it yet so to kill some time I start looking to decide what kind of AR 10 upper I want/can afford. Now I'm stumped. It appears that there are at least 3 different pattern AR 10s. DPMS, Armalite, and I forget the third. How do I know what one I have? What happens if I can't figure it out and I guess wrong? Am I correct that an AR 10 lower parts kit purchased from a reputable supplier will fit no matter which type of lower I have? What about magazines. I've seen some references that seem to indicate that there is even more than one type of magazine, does that mean that some lowers won't take some magazines? Any information you all could provide me would be most appreciated. You do have the ULTIMATE conundrum of franken-built AR's. An 80% .308 receiver that YOU finished. Well, what receiver blank did you start with and HOW (what specs) did you finish your receiver to? You are the one who built the damned thing! 
"I built something! Guess what I built...!? And what's it compatible with?" 
AIN'T NOBODY GOT TIME FO DAT! AFAIK - The big three are: 1) ARMALITE pattern (early gen requiring Armalite mags & current gen that takes P-MAGS) 2) DPMS pattern (older gen Longer Action compatible with SR-25 pattern stuff and new G2 gen Smaller Action) 3) RRA LAR pattern (LAR-8/FAL mags) 
Have Fun!  
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| whose lower did you purchase...........contact the seller for information on matching it with a correct upper........DPMS seems to be the most common............Once you navigate the un- commonality of the platform and purchase the correct parts..........you will have it made in the shade............do a little research..........twice!! |
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Read through this thread. There are way more than 3 major types. I lost count long ago, and the variations keep coming every month practically.
Pin diameters and lengths are different on the LPK's, as are bolt catches. Magazine catches need a longer shaft in many cases. Even within manufacturers, there are changes that affect parts commonality in a generation, not even talking Gen I to Gen II like with DPMS. DPMS had at least 2 different rail heights in the LR-308 and AP4 rifles long before the GII was introduced. What 80% did you start with? Is it Tactical Machining? Whatever pattern was used to make your 80% will determine compatibility. |
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Quoted:
... Well, what receiver blank did you start with and HOW (what specs) did you finish your receiver to? If I knew that would I be asking what one I have? You are the one who built the damned thing!
"I built something! Guess what I built...!? And what's it compatible with?" AIN'T NOBODY GOT TIME FO DAT! ... I'm trying to figure out how any of that is helpful... or was this being funny?... Quoted:
Quoted:
.... I bought the 80% receiver at a gun show thinking that, like an AR 15 one was pretty much the same as another. ...Now I'm stumped. ...How do I know what one I have? ... Well, what receiver blank did you start with and HOW (what specs) did you finish your receiver to? If I knew that would I be asking what one I have? You are the one who built the damned thing!
"I built something! Guess what I built...!? And what's it compatible with?" AIN'T NOBODY GOT TIME FO DAT! ... I'm trying to figure out how any of that is helpful... or was this being funny?... I really do appreciate the helpful responses I received. Yes I went into this project in ignorance. Yes I didn't find out everything that I needed to know. So I appealed to those who had first hand knowledge for help. Some of you were quite helpful. On the other hand... I know some people who hesitate to as questions or post questions because they are afraid they will be subject to ridicule. Luckily, I'm not one of them. Again, for those who offered helpful suggestions, thanks (I do feel stupid for not including a photo). From responses I've received and other information I've gained I have concluded that I have a DPMS pattern lower. Time will tell if I'm correct. Worse case I'll just have to get another lower that fits the upper that I buy. |
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Bro, My response was meant TONGUE IN CHEEK and I tried to be helpful.
I am just shocked by the ignorance in "YOU BUILT IT" but you don't have any idea of WHAT you built? Just reminds me of that Johnny Cash Song: ONE PIECE AT A TIME The three MAJOR types can be defined by the MAGAZINE (in my post), with MANY-MANY other subtypes or off shoots. Again, WHAT LOWER did you start with, and to WHAT SPECS did you finish it? I am guessing STANDARD AR-15 fire control parts & bolt catch... The rest is WHAT YOU DID. Does it accept .308 P-Mags? Hell, post a picture and maybe someone can point you towards an UPPER that MAY fit, but FEEDING from a MAGAZINE is ANYBODY's guess. So you don't even know what SPECS you finished it to? How in the world did you finish it then? All the best! ~Will |
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