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Old July 27, 2012, 09:16 PM   #1
Join Date: May 11, 2011
Posts: 25
Differences between AR-10 & AR-15

I know the obvious (.308 vs. .223) but I want to build my own AR-10 (I know, only Armalites are AR-10s, but humor me) and the info isn't as generous and easy to sift through as with an AR-15 since not all AR-10s are interchangeable? Couple questions...

1. Do they use the same buffer tubes?

2. Do they use the same lower parts kits?

Basically, which parts are interchangeable between the two, and what should I look out for or know, that will be different from my AR-15 build?

Any help is appreciated, even brand suggestions... DPMS? Thanks
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Old July 27, 2012, 11:31 PM   #2
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The rifle buffer tubes are the same length, but the buffers are different lengths and weights to compensate for the differences in the -10/-15 bolt carrier groups.

The buffer tube for the Armalite -10 collapsible stock carbine is a unique length not found in any other carbine. It requires a buffer with a unique length.

In the lower parts kit, the takedown pin, pivot pin and bolt stop are different between the -10/-15. The Armalite -10 magazine catch has a unique kink in it not found in any other AR. This is because the M-14 heritage magazines have a tapered cross section, not rectangular like other ARs. DPMS LR308 uses a screw instead of a roll pin to secure the bolt stop.

At this time, the biggest difficulty in building a -10/-15 is availability of components. They simply cannot be found for any price. High demand caused components supply to dry up because folks are afraid that Obama will beat Milquetoast Romney in November.

Last edited by DnPRK; July 27, 2012 at 11:37 PM.
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Old July 28, 2012, 06:19 AM   #3
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Do they use the same buffer tubes?
No, no in every case. Normally a .308 platform AR well use a RE (collapsible stock) that's 1/2inch longer than the AR15 RE. Exception is the DPMS LR-308, it uses a AR15 RE with a shorter buffer. A2 RE's are the same length for both platforms.

Do they use the same lower parts kits?
The FCG and safety are interchangeable as are most springs and detents. Pivot pin and take down pin are larger and the bolt catch and mag release can be proprietary between brands.

Basically, which parts are interchangeable between the two, and what should I look out for or know, that will be different from my AR-15 build?
This FAQ well help you see the difference between the different platforms. The biggest different is the magazine, you have M14, G3, FAL, and SR-25. The SR-25 (Pmag) is the defacto standard, what ever you build it should be SR-25 unless you get a real good deal on another style. The different mags are very close in price and availability.

Barrel nuts are different between brands and effect what hand guard well fit. Some DPMS uppers have a"high" rail and DPMS uppers are extruded 6000 aluminum, the other brands are all forged 7175 or higher grade aluminum.

Not all .308 AR BCG's are the same quality, I do know that ArmaLite builds there AR10A&B BCG's using the AR-15 mil-spec for material, shoot peened 8620 carriers and C158 bolts.

Mega has a very nice upper/lower to build from, another I like is the new AXTS .308 lower.
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