ArmaLite AR-10A DSR10

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Quentin

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For some reason there's not a lot of buzz over the new 7.62x51 ArmaLite DSR10 but it's a lot of rifle for the money, in my opinion. I just got one and am pleased with the quality for $1000, only a couple hundred more than a good PSA 308 AR build. Nothing wrong with PSA, in fact I've used a lot of their parts with good results in a couple AR-15 builds. The biggest down side of PSA is finding what you want in stock.

I've been longing for a .308 AR and since ArmaLite introduced the A series that uses the original 1950s AR-10/SR-25/PMAG magazines it rose to the top of my list. A year ago when the DSR10 came out at a bargain price they really had my attention. So I finally got my first factory built AR and first in .30 caliber.

This rifle is known as the ArmaLite Defensive Sporting Rifle 10, or ArmaLite DSR10, or ArmaLite DEF10, and in California as the ArmaLite SPR Mod 2A. But none of that is rollmarked anywhere on my rifle; instead AR-10A is stamped on both the lower and upper receiver. The “A” after AR-10 means that it’s designed to use the old 1950s ArmaLite AR-10/AR-10A style magazine that Eugene Stoner used way back then and again in the early 1990s when he was designing the Knight’s Armament SR-25.

(Funny thing about the SPR Mod 2A, California has “AR-10” on their banned list so you can’t go in a gun shop there and buy one but you can buy a slightly neutered version with the bullet button and neutered name. However, ArmaLite had some fun with that name, rumors are it stands for Special Purpose Rifle Model 2nd Amendment! Of course the name also borrows from the military 5.56mm SPR Mod 1.)

This is a nice rifle for the price, very well built for a low cost model. I’m impressed, they really priced this one to sell. It is my first factory built AR and I like almost everything about it. First, the lightweight 16” double lapped barrel is marked 7.62 NATO CR-MO CL 1:11.25, so it’s chrome lined with an 11.25 twist. I’m glad it has the midlength gas system like many ArmaLite carbines and of course the evil (non-CA compliant) flash hider is installed. The upper and lower receivers are 7175 hard anodized aluminum as you’d expect from any quality AR. The receivers fit snug with no slop and the black finish is very good. The rifle weighs in at 7.9 pounds with no sights or magazine, which is fairly light for an AR-10. But they didn’t scrimp on the BCG, that thing weighs 18 ounces and is mated to an H3 carbine buffer. The only thing that does slop around is the M4 buttstock, but they all do so that was the first thing to change out. Since the receiver extension is milspec diameter I grabbed my old Magpul ACS stock from the closet and it fits very snug, no slop. My other ARs are builds and I always use the milspec tube so was glad ArmaLite felt the same way. It would have bugged me to be stuck with a commercial diameter tube and not be able to easily swap stocks with my other ARs. (And have to buy a stock when I already had a perfectly good ACS.) The ACS adds 8 ounces right up against the shoulder which won’t hurt much, in fact it moves the center of balance toward the rear. The ACS also has a rubber pad that will help with recoil over the hard M4 stock. The ACS was a little much on a lightweight AR-15 but is about right on the AR-10. I think it’s found a home.

The trigger group is a standard AR-15 single stage trigger while more expensive ArmaLite ARs come with a two stage trigger. I lucked out, the trigger is quite good for a milspec, some are terrible. It’s about 6-7 pounds and crisp, comparable to an ALG QMS trigger. I doubt all DEF10 triggers are that good but I’ll take it. I like that many lower receiver parts are standard AR-15 parts, along with the stock, pistol grip and handguards. Of course many parts must be larger due to the AR-10’s larger 7.62 NATO round. No sights come with the DEF10 so I bought an ArmaLite front sight and Magpul MBUS2 flip up rear sight. And I borrowed a red dot for now. The RDS kept its bottom 1/3 cowitness from another AR so this one has a good mechanical zero right now. I also threw on a cheap M4 sling for now. I’m getting a Raptor charging handle and a BCM pistol grip, I’ve been wanting to try them out and now have a good excuse.

Enough talk, now some pictures!

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I got the ArmaLite/Raptor charging handle and BCM pistol grip so I'll update with more pictures. I love the charging handle, lukewarm to the pistol grip right now. However, it does feel better than the old A1 grip. I'm glad BCM includes a flat head screw to mount it. I've gone to the flat head screw in all my AR builds but this ArmaLite came with the 3/16" hex head screw - now it's upgraded to my standard. I like the look of the hex head better but the flat head makes more sense, in an emergency it's a lot easier to find a screwdriver than hex wrench. Yeah, I got a hat, too!

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Specifications ...

ArmaLite AR-10® A-Series Defensive Sporting Rifle, DSR10, DEF10

Caliber .................... 7.62X51 mm NATO / will accept .308 Winchester
Action ..................... Semi-automatic rifle, direct-impingement
Barrel ..................... 16" button cut, double lapped, chrome lined / 4140 chrome moly, lightweight profile
Rifling Twist ............. 1:11.25” RH 6 groove (works well with 150-175 grain ammo with 168 grain being ideal)
Feed Ramps ............. M4 feed ramps
Gas system length .... Mid-length, gas tube length - 12-1/16” (0.180” OD and 0.117” ID)
Muzzle Device .......... A2 birdcage style flash suppressor (threaded 5/8"x24 TPI)
Bolt ........................ Bolt is 8620 steel, batch tested, shot peened and grit blast finished
Bolt Carrier .............. Carrier is 8620 steel, staked gas key, carrier & gas key chrome lined
Sights ..................... Optics ready, Picatinny rails provided, no sights included
Front Sight Base ....... MIL-STD 1913 rail on a .750” clamping gas block
FSB rail offset .......... Top of gas block is .398 (+/- .010) lower than top of receiver
Handguards ............. Standard M4-style with single heat shields (8" Mid-length)
Grip ........................ Standard A2 style pistol grip
Stock ...................... Standard M4 6-position collapsible stock, length of pull 11-1/8” to 14-1/2”
Upper Receiver ......... Forged flat-top receiver with MIL-STD 1913 rail, forward assist 7175-T74
Lower Receiver ......... Forged 7175-T73 aluminum alloy
Rifle controls ............ Standard AR-15 position / function
Magazine Type .......... Original ArmaLite AR-10/SR-25/PMAG form factor
Receiver Extension .... Carbine length tube, milspec O.D. diameter - 1.145” - 1.147”, 7-5/8” (inside depth)
Buffer Type .............. H3 heavy carbine buffer, 3-1/4” - weight 5.4 oz
Buffer Spring ........... .308 buffer spring - carbine length 13-1/8” - weight 1.8 oz
Trigger .................... Single-stage, standard milspec AR-15 trigger group
Charging Handle ....... Standard ArmaLite AR-10
Finish ...................... Hard anodized aluminum receivers, manganese phosphated steel barrel
Overall Length .......... Variable overall length of 35.0" to 38.3"
Weight ..................... 7.9 lbs. (no sights, no magazine)
Coloring ................... The rifle and all the furniture feature a matte black finish
Included with rifle ..... One 20-round Magpul M3 PMAG, Owner’s Manual
Warranty .................. Limited lifetime warranty for original owner
Part Number ............. DEF10
UPC Number ............. 651984014257
MSRP/Street Price ..... $1,049 / $996

The Defensive Sporting Rifle 10 is made and tested in Geneseo, IL, USA under the same quality standards ArmaLite has provided for the last 60 years. Legendary ArmaLite quality in a streamlined platform, the DSR10 is a high quality, no frills carbine well suited for duty, sport, or defense. These carbines are “optics-ready” and do not come with sights or optics, leaving that spending decision up to the user. The Defensive Sporting Rifle 10 uses a double lapped, chrome lined/chrome moly barrel for extreme durability and accuracy, and comes with a 20-round Magpul M3 PMAG. The DSR10 accepts all ArmaLite parts designed for AR-10® A-Series rifles. It also accepts standard Magpul PMAG LR/SR M3 magazines (10, 20 and 25 rounds). (The DSR10 B-Series uses proprietary ArmaLite/M14 magazines.) *

Hard-hitting and rugged at home, on the range or in the field, serious carbine shooters deem the ArmaLite AR-10® carbine as the heavy caliber to own. Tactical flexibility combined with the compact length of the 16-inch barrel and collapsible stock are standard to any A4 carbine model; but add in the advancements that our engineers have made standard on every ArmaLite AR-10®—such as improved feeding, extraction and ejection—and there is not another heavy caliber carbine that can compare.

* The AR-10A family of ArmaLite rifles is functionally identical to our AR-10B family. Operation, controls, and maintenance are the same however, the AR-10A family is designed to accept early ArmaLite AR-10 “Waffle” magazines and other magazines copied from them. The AR-10B family accepts our proprietary steel magazines introduced due to the 1994 AWB. Neither family of rifles will function correctly with the other alternate magazine. ArmaLite AR-10 parts will fit either family with the exception of the upper receiver, lower receiver, bolt hold open, magazine catch and magazine (there are A and B versions of these five parts).

AR stands for ArmaLite.

A review of the DSR10
http://www.tactical-life.com/firearms/gun-review-armalite-dsr-10/#armalite-dsr-10-swmp-jan-2015-lead
 
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Congrats! Armalite is my preferred make, miss my AR-10A2C. But when the time came to build another .308 AR last February, putting one together the way I wanted it was a lot more economical With PSA. I'm into the rifle for under $1,200 including shipping/tax, and that's built on an Ares signature billet lower with Magpul ACS stock, MI SSK15 handguard and Black Rain 3.5# trigger. I also wanted an 18" tube instead of 16". To have started with a DEF10, I'd have been over $2K by the time I was done.

Nonetheless, I'll almost certainly have another Armalite at some point. A future lightweight build may well start with a DEF-10, 'cause my current rifle certainly isn't very light!
 
That's likely the AR10 I'd have purchased, if DPMS hadnt had a $200 off rebate Black Friday sale on their G2's. A 7ish pound AR10 is hard to argue with.
 
Yeah, it's becoming the golden age of the .308 AR. Quality is way up over the last few years and price is way down. If you build there still are compatibility issues compared to the AR-15 but for those who pay attention to details either platform is pretty easy.

I had been considering a PSA build and the 18" S&W M&P10 but the DEF10 is pretty much the lightweight carbine I wanted so I went with the factory build. I don't plan on any major changes.
 
Chicharrones, I recently saw an old post of yours, one of the first mentioning the Defender series. I hope it works out that you get one! Seems like they're hard to find right now but they do show up here and there.
 
A small correction. The Armalite AR10 receivers are not made from 7075. They are made from 7175 which is a stronger, more durable alloy
 
Chicharrones, I recently saw an old post of yours, one of the first mentioning the Defender series. I hope it works out that you get one! Seems like they're hard to find right now but they do show up here and there.

In .308? Someday, someday! Until then, I'll have to make do with my pre-Defender M15. For whatever reason, it came with the lower marked as an SPR. :scrutiny: :)

arma-pig-1.jpg


spr-mod-1.jpg
 
Nice rifle. Thanks for the details. I'm an Armalite fan and have one of their M4 varieties. If (when) I take the AR10 plunge I'd likely make the exact same choice you did.
 
These new generation lightweight AR10's are kinda kicking dirt in the face of classic, 10lb .308 rifle designs. AR15 size/weight launching a .308 payload is hard to dislike;). Now we just need one design to "standardize" the lightweight AR10 platform.
 
A small correction. The Armalite AR10 receivers are not made from 7075. They are made from 7175 which is a stronger, more durable alloy

You'll gave to explain how that could be true. Here's the information I could find from two aluminum manufacturers.


Kaiser 7075-T651

Tensile 83 KSI
Yield 73 KSI

Kaiser 7175-T7351
Tensile 72 KSI
Yield 61 KSI

Alcoa 7075-T651
Tensile 67-75 KSI
Yield 54-65 KSI

Alcoa 7175-T7351
Tensile 65-71 KSI
Yield 53-60 KSI
 
In .308? Someday, someday! Until then, I'll have to make do with my pre-Defender M15. For whatever reason, it came with the lower marked as an SPR. :scrutiny: :) ...

Yes! 308!

That's interesting your M15 is stamped SPR Mod 1, did you buy it in California? My ArmaLite M15 lower (bought stripped) is marked M15. It was made in 2007 if that matters.
 
That's interesting your M15 is stamped SPR Mod 1, did you buy it in California? My ArmaLite M15 lower (bought stripped) is marked M15. It was made in 2007 if that matters.

I bought it as a brand new ArmaLite factory built carbine in Houston, Texas in 2013. It originally came with the ubiquitous collapsible butt stock assembly and A2 grip. The now discontinued model number is 15A4CBA2K.

From what I've seen, many of those models got shipped out with the SPR marked lower. I'm not sure why, since at the time ArmaLite still had the SPR Mod 1 in their product lineup. I figure they had a surplus of those lowers and put them to use on the 15A4CBA2K.
 
These new generation lightweight AR10's are kinda kicking dirt in the face of classic, 10lb .308 rifle designs. AR15 size/weight launching a .308 payload is hard to dislike;). Now we just need one design to "standardize" the lightweight AR10 platform.

It would be nice if the 308 AR was standardized like the AR-15. But it's really not too bad now with the AR-10A using PMAGs. You can blame the Clinton AWB for ArmaLite going with the M14 magazine form factor in the AR-10B. (It was a legal way to offer 20 round magazines.) DPMS was late to the party in 2004 and with the sunset of the AWB could go with the original 1950s AR-10/KAC SR-25 form factor. Fortunately ArmaLite redesigned their receivers so you can have the B or A form factor today. Now RRA needs to offer a PMAG version in addition to their FAL magazine version!

DPMS cloned the AR-10 bolt carrier and barrel but not the barrel extension, bolt lugs and barrel nut. From what I hear you can put a DPMS 308 barrel in an AR-10 if you use the DPMS BCG and the ArmaLite barrel nut!

ArmaLite was clever designing the AR-10 carbine buffer tube, they made it 3/4" longer than the M4 carbine tube so you can use existing 5.56 M4 buffers in the AR-10 carbine (mine has a standard H3). DPMS went to a funky shorter buffer that's not compatible with the M4.

I think the "standard" is the 1959 AR-10A which used the AR-15 trigger group, charging handle style and other parts. Then in 1993 Eugene Stoner and Knight's Armament updated his old design into the SR-25. Eagle Arms/new ArmaLite used both designs for their 1995 AR-10 but the AWB threw a spanner in the works. Today's ArmaLite AR-10A is quite close to an updated 1959 AR-10A!
 
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A small correction. The Armalite AR10 receivers are not made from 7075. They are made from 7175 ...

You're right MistWolf, I did say 7075 in the first post but corrected it to 7175 in the specifications post. I've noticed even ARmaLite often interchanges the two alloys in their own specs! It seems that their 5.56 AR receivers are 7075 and 7.62 receivers are 7175.
 
You'll gave to explain how that could be true. Here's the information I could find from two aluminum manufacturers.


Kaiser 7075-T651

Tensile 83 KSI
Yield 73 KSI

Kaiser 7175-T7351
Tensile 72 KSI
Yield 61 KSI

Alcoa 7075-T651
Tensile 67-75 KSI
Yield 54-65 KSI

Alcoa 7175-T7351
Tensile 65-71 KSI
Yield 53-60 KSI

Interesting. When I looked at the alloy a few years ago, the information I got was that 7175 made tougher, more durable forgings
 
You'll gave to explain how that could be true. Here's the information I could find from two aluminum manufacturers.


Kaiser 7075-T651
Tensile 83 KSI
Yield 73 KSI

Kaiser 7175-T7351
Tensile 72 KSI
Yield 61 KSI

Alcoa 7075-T651
Tensile 67-75 KSI
Yield 54-65 KSI

Alcoa 7175-T7351
Tensile 65-71 KSI
Yield 53-60 KSI

There are other important numbers. 7175 has higher fracture toughness and better resistance to stress corrosion cracking. Also, the -XX51 applies to sheet and plate material. Forgings are just -T73.

http://www.engineersedge.com/aluminum_tempers.htm
 
So, how long are you going to keep that red dot on there? Any plans to scope it?

Sure I'll test it with a scope, but mostly I'll be shooting 100 yards or less for now. The red dot is borrowed from a 5.56 AR for now. I'm having cataract surgery in a couple months and if that goes well I may want to reach out and touch! I haven't got it out to the range yet but hope to on Friday.
 
Nice rifle; excellent write-up! Thanks for the pics. It sounds like a good deal.

Geno
 
my dad recently purchased this exact same gun but with a fixed stock. it's for hunting but with a scope and full mag, weighs a ton. maybe i'll build a bench gun in .308 one day.
 
Cool rifle.

I just want to confirm that I am reading correctly above: It is fully compatible with all AR15 pistol grips and selectors, right?

How about the magazine catch, is it straight off an AR15, or is it unique?
 
Cool rifle.

I just want to confirm that I am reading correctly above: It is fully compatible with all AR15 pistol grips and selectors, right?

How about the magazine catch, is it straight off an AR15, or is it unique?

The AR-10 magazine catch is different, as are the take down pins. The selector and trigger group are standard AR-15 parts. The A2 pistol grip is the same but extended grips like the MOE/MIAD fit sloppy at the top (more of a cosmetic issue).
 
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