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File 140062380647.jpg - (525.42KB , 1280x960 , P1030285.jpg )
2703 No. 2703 ID: d5e5a4
Field stripping an ArmaLite AR-18 rifle.

According to this forum post, only 5,189 AR-18/180 were produced from the Costa Mesa facility between 1969 and 1972.
http://smith-wessonforum.com/lounge/281330-armalite-ar-18-ar-180-a.html
Expand all images
>> No. 2704 ID: d5e5a4
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2704
Came with 1 original AR-18 magazine and 2.75x optic (made in Japan).

The AR-18 magazine is basically an AR-15 magazine, except that the slot for the mag catch is on the opposite side of the mag body. Converting AR-15 mags to fit in a AR-18 just takes some dremmeling.
>> No. 2705 ID: d5e5a4
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2705
After designing the AR-15, Stoner developed the AR-16, a short-stroke gas-piston stamped steel rifle in 7.62x51.

After Stoner left ArmaLite, the AR-16 was scaled down for 5.56x45, and the AR-18 was born.
>> No. 2706 ID: d5e5a4
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2706
Flash hider, and according to the manual the rifle can fire rifle grenades, using grenade-firing blanks.
>> No. 2707 ID: d5e5a4
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2707
Rear of the receiver.
To collapse the stock, push the top (cone thingy) and bottom buttons/detents on the right side of the stock.
>> No. 2708 ID: d5e5a4
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2708
shitty pic through the optic
>> No. 2709 ID: d5e5a4
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2709
Let's start the takedown process.

Push the button in the t-shaped handle behind the rear sight.
>> No. 2710 ID: d5e5a4
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2710
After the button is depressed, push the entire t-shape into the receiver. Note how the "T" slides between the rear sight.
>> No. 2711 ID: d5e5a4
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2711
Pivot the upper receiver upwards, and ease the guide rod assembly out of the receiver. Be careful, the dual recoil springs are under compression and the entire thing will launch out if you're not careful.
>> No. 2712 ID: d5e5a4
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2712
now pull the entire recoil assembly out
>> No. 2713 ID: d5e5a4
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2713
Now it's time to remove the charging handle.
Spring-loaded dust cover system, somewhat similar to an AR-15.

Note that the front-takedown pin is still in place.
Minor nitpick: the front pin is NOT captured, and is slightly annoying to re-align when reassembling the firearm.
>> No. 2714 ID: d5e5a4
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2714
The charging handle fits very very loosely in the bolt. The handle doesn't 'click' into the bolt at all. There's a lot of wobble. The frame of the receiver actually keeps the handle in place while the gun is assembled.

Pull the charging handle all the way to the rear. When the gun is assembled, the bolt will never travel that far back, so the charging handle won't fall out on accident.
>> No. 2715 ID: d5e5a4
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2715
Lift the charging handle out.
>> No. 2716 ID: d5e5a4
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2716
Once the charging handle is removed, the bolt carrier just slides out the rear of the receiver.
>> No. 2717 ID: d5e5a4
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2717
Hmm, this bolt face looks familiar.
>> No. 2718 ID: d5e5a4
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2718
Obviously, this bolt is not original.

Next, we remove the firing pin retaining pin.
>> No. 2719 ID: d5e5a4
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2719
Push the pin out from the opposite side.
The tip of a 5.56 cartridge would be perfect to use.
>> No. 2720 ID: d5e5a4
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2720
A spring loaded firing pin, interdasting.
>> No. 2721 ID: d5e5a4
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2721
To remove the bolt cam pin, push/rotate the bolt to the rear.
Turn the cam pin 90 degrees, then lift the pin out.

Takes a bit of dexterity to get your fingers in there to turn the pin. The AR-15 bolt cam pin is easier to remove.
>> No. 2723 ID: d5e5a4
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2723
Here's the bolt. Look familiar?
>> No. 2724 ID: d5e5a4
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2724
Look ma, no gas rings!
>> No. 2725 ID: d5e5a4
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2725
7 lugs.

Didn't bother to remove the extractor, but it's the same process as an AR-15.
>> No. 2726 ID: d5e5a4
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2726
Looking at the chamber in the upper receiver.
The two circles on the top left and top right are where the recoil springs go, the piston is in the middle.
>> No. 2727 ID: d5e5a4
File 140062648495.jpg - (573.27KB , 1280x960 , P1030311.jpg )
2727
Looking through the upper receiver.
The bolt space is roomier in here than an AR-15, supposedly increasing reliability; the bolt cam pin rides in the left-side channel.
>> No. 2728 ID: d5e5a4
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2728
And here's the FCG.

Note the BHO on the right side of the pic. The end protrudes into the magwell. The bolt will lock on an empty magazine, or if you stick your finger into the magwell and push the tab up while holding the bolt to the rear.

There is no bolt release paddle like on an AR-15.
>> No. 2729 ID: d5e5a4
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2729
I have de-cocked the hammer and walked it down.

DO NOT LET THE HAMMER DROP WHILE THE GUN IS STRIPPED OR YOU WILL BREAK THE BOLT HOLD OPEN!
>> No. 2730 ID: d5e5a4
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2730
The BHO is actually on a hinge. You can flip it to the rear out of the way.

Note the front takedown pin to the left. Having a captured pin would've been better.
>> No. 2731 ID: d5e5a4
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2731
Magwell. Note the BHO is in place, hammer is decocked. This is not the usual case. Leave the hammer cocked and the gun on safe.
>> No. 2732 ID: d5e5a4
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2732
And that's all for now.
Hope you enjoyed it.
>> No. 2733 ID: b5332d
Interesting. When was yours made? There are a few features on this thing that aren't present in later AR-18's.
>> No. 2734 ID: d5e5a4
>>2733
I'm still trying to figure out the date. The only serial number ranges I can find online all pertain to the AR-180.

I'm not sure if the current version of Armalite in Geneseo would have records from Costa Mesa.
>> No. 2735 ID: d5e5a4
>>2734

Yeah, just called Armalite, they don't have any records from Costa Mesa.
>> No. 2739 ID: 3fd22c
Always wanted one of those...
Well at least I have some photos now.
>> No. 2788 ID: b16efc
>>2703
Late to the party, but very cool stuff AC.
>> No. 2885 ID: 746057
More photos of the piston system on monday!
>> No. 2896 ID: d5e5a4
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2896
they're not the best pictures, but oh well

let's disassemble the piston system, shall we?
>> No. 2897 ID: d5e5a4
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2897
but first, we remove the flash hider
>> No. 2898 ID: d5e5a4
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2898
hello mr. flash hider!
>> No. 2899 ID: d5e5a4
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2899
So, once the recoil spring assembly is removed, the top handguard easily comes off.
>> No. 2900 ID: d5e5a4
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2900
First you pull the piston back and remove the middle piece.
>> No. 2901 ID: d5e5a4
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2901
>>2900
like so.
>> No. 2902 ID: d5e5a4
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2902
>> No. 2903 ID: d5e5a4
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2903
next comes the piston and spring
>> No. 2904 ID: d5e5a4
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2904
then the sleeve
>> No. 2905 ID: d5e5a4
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2905
and here's the tappet and gas rings
>> No. 2906 ID: d5e5a4
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2906
>> No. 2907 ID: d5e5a4
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2907
I'm having a friend convert some AR-15 mags for me.

We ground a bit of the 'hump' under the 15's latch hole so that it fit a bit easier into the 18's magwell, but it's not strictly necessary. It's just a bit tight if you don't.
>> No. 2908 ID: d5e5a4
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2908
and here's the other side of the mag, showing the cut for the 18's catch.
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