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bic17
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Posted: 7/24/2011 9:48:07 PM

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Hi everybody,

If I was to build the lightest milspec AR15 possible (reliable and durable) under the below requirements, what would that be?

16" Barrel with flash hider
Semi Auto Receiver .223/5.56
Quadrail Forearm
Light System
Red Dot Optic
BUIS sight system (cowitnessing with red dot)
Polymer magazine
Sling
Pain
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Posted: 7/24/2011 10:00:05 PM
[Last Edit: 7/24/2011 10:00:49 PM by Pain]
If you want it light, them I'd have no rail, no light and find a skinny 14.5 inch barrel. Have a flash hider pinned and welded in place to make the length legal. Run irons or a tiny optic.

Keep it simple and the gun will weigh 6-7 LBS. The more stuff you add, adds weight.
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dump1567
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Posted: 7/24/2011 10:16:35 PM
Originally Posted By Pain:
If you want it light, them I'd have no rail, no light and find a skinny 14.5 inch barrel. Have a flash hider pinned and welded in place to make the length legal. Run irons or a tiny optic.

Keep it simple and the gun will weigh 6-7 LBS. The more stuff you add, adds weight.


This.

The DD 1.5 rear sight is pretty light. You may be even able to find an old Colt BCG with the back rear removed to go even lighter.
I have no time for gun shop lore, myths & legends, and just plain nonsense.
chibajoe
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Posted: 7/24/2011 10:27:42 PM
Originally Posted By bic17:
Hi everybody,

If I was to build the lightest milspec AR15 possible (reliable and durable) under the below requirements, what would that be?

16" Barrel with flash hider
Semi Auto Receiver .223/5.56
Quadrail Forearm
Light System
Red Dot Optic
BUIS sight system (cowitnessing with red dot)
Polymer magazine
Sling


7 pounds if you use a cut down pencil barrel, otherwise 7.5-8 pounds.
TCBA_Joe
2 Round Burst
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Posted: 7/24/2011 10:43:12 PM
Originally Posted By bic17:
Hi everybody,

If I was to build the lightest milspec AR15 possible (reliable and durable) under the below requirements, what would that be?

16" Barrel with flash hider lightweight profile, cut pin and weld 14.5" for even lighter
Semi Auto Receiver .223/5.56 They're all really the same, just stay away from billet
Quadrail Forearm DD are light. KAC URX is light. Look at something like the Troy tube for even lighter
Light System SF x300 or m300a Scout, or a TLR-1
Red Dot Optic Aimpoint T-1 micro in a DD mount
BUIS sight system (cowitnessing with red dot) KAC Micro sights, pricey but light, DD 1.5 if you have a fixed FSP
Polymer magazine Don't know what's "lightest", just find reliable, they all weight about the same
Sling Don't worry about weight, find one that's comfortable and it'll make it feel lighter slung.


You're basically looking at any number of standard ARs.
Please, call me Joe

There is definitely something perverse about two men who carry guns 24/7 being so happy that others are giving theirs up. -happycynic
N2CH_556
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Posted: 7/24/2011 11:07:53 PM
google project featherweight
scromer
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Posted: 7/25/2011 12:36:28 AM
Originally Posted By Pain:
If you want it light, them I'd have no rail, no light and find a skinny 14.5 inch barrel. Have a flash hider pinned and welded in place to make the length legal. Run irons or a tiny optic.

Keep it simple and the gun will weigh 6-7 LBS. The more stuff you add, adds weight.


Like this:

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RifleCal30m1n00b
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Posted: 7/25/2011 4:16:39 AM
Originally Posted By scromer:
Originally Posted By Pain:
If you want it light, them I'd have no rail, no light and find a skinny 14.5 inch barrel. Have a flash hider pinned and welded in place to make the length legal. Run irons or a tiny optic.

Keep it simple and the gun will weigh 6-7 LBS. The more stuff you add, adds weight.


Like this:

http://img.photobucket.com/albums/v492/sdcromer/AR15/IMG_1303.jpg


I like.

Someday I'll do a 723 quasi-clone that'll end up looking a lot like this...
survivorman
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Posted: 7/25/2011 6:51:42 AM
balloo93
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Posted: 7/25/2011 7:16:11 AM
IMO, if I was building to be the lightest setup I would use:

Cav Arms lower cut down to entry length with standard carbine buffer.
Upper receiver with no forward assist (I'd probably just run a regular upper with FA).
Pencil barrel cut down to 14.5" and pinned with a Spikes DynaComp or a XA2 flash hider.
Low profile gas block.
Troy Industries 13" TRX Extreme Battle Rail.
Viking tactics flashlight mount and a G2 LED light.
Magpul Gen2 MBUS sights.
Trijacon Reflex sight or light Aimpont set up.
Garandboy
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Posted: 7/25/2011 9:01:11 AM
14.5 Pencil barrel with pinned FS to 16"

No rail or light. Those go against the concept. 9mm flat top with a hole drilled for the gas tube will save some ounces by removing the forward assist.
Handy little carbine. The M44 is a combination flash bang grenade, flame thrower, rifle and spear all in one.
gotigers
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Posted: 7/25/2011 9:09:35 AM
The Midwest Industries FF tube is 11.3oz. The Troys are heavier. rail chart
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1811guy
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Posted: 7/25/2011 10:06:08 AM
[Last Edit: 7/25/2011 10:10:20 AM by 1811guy]
5.6 lbs. empty. It uses a DD 16" lightweight barrel:



Start adding optics, rail and light, it fattens up fast. Too keep it light though, an Aimpoint T1 is 3oz, LT T-1 mount is ~ 2 oz., SF X300 is 3.8 ounces, and a DD EZ-CAR is 9.1 oz. Subtract 6.85 oz. for the MOE handguard, and all that will add 11 oz. to the gun for a total weight of about 6.3 lbs. Those parts will run around $1,100 - making something light usually isn't cheap. You could shave a couple ounces off the gun by keeping the MOE handguard with an accessory rail to mount the X300, and save about $150 in the process. Weight would be around 6.1 lbs. Cost for the rifle and accessories would be in the neighborhood of $1,900.

Difference between a 14.5" and 16" LW barrel is negligible - just a couple ounces. Not worth it IMO. Better to have the ability to remove the FH further down the road IMO.

1811guy
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Posted: 7/25/2011 10:12:30 AM
[Last Edit: 7/25/2011 12:38:55 PM by 1811guy]
Originally Posted By scromer:
Originally Posted By Pain:
If you want it light, them I'd have no rail, no light and find a skinny 14.5 inch barrel. Have a flash hider pinned and welded in place to make the length legal. Run irons or a tiny optic.

Keep it simple and the gun will weigh 6-7 LBS. The more stuff you add, adds weight.


Like this:

http://img.photobucket.com/albums/v492/sdcromer/AR15/IMG_1303.jpg


Looks just like a Colt 6520 (with a 14.5" bbl) - 5.7 lbs empty. My favorite AR.
evlblkwpnz
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Posted: 7/25/2011 10:15:45 AM
Why not just go buy a Shootrite Gaytana? A buddy of mine was just telling me yesterday about how badass they are
I am a slave to my creations.... my image cannot be seen in them, but they bear my heart and soul - evl....
Garandboy
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Posted: 7/25/2011 10:25:56 AM
Originally Posted By evlblkwpnz:
Why not just go buy a Shootrite Gaytana? A buddy of mine was just telling me yesterday about how badass they are



And so it begins.
Handy little carbine. The M44 is a combination flash bang grenade, flame thrower, rifle and spear all in one.
JB71
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Posted: 7/25/2011 11:43:51 AM
I just finished this....5.6lbs empty....


1811guy
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Posted: 7/25/2011 12:35:04 PM


I saw that in the other LW thread - very nice build. Excellent example of a KISS rifle.
shadowcop
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Posted: 7/25/2011 12:47:46 PM
[Last Edit: 7/25/2011 12:48:34 PM by shadowcop]
Here is one I threw together using a 16" CMMG 5.56 pencil barrel.
Weighs 6lbs. without the optic.
"Better to die for something than live for nothing"

gotigers
Buck Ofama
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Posted: 7/25/2011 12:48:51 PM
Originally Posted By 1811guy:


I saw that in the other LW thread - very nice build. Excellent example of a KISS rifle.


I agree. Great KISS
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cjk1
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Posted: 7/25/2011 12:59:08 PM
I've got a a USAF GUU-5/P clone that is pretty light, and was even lighter when it still had its lightweight barrel.

...but I've been planning an ultralight build for some time though, and here are some of the features that I'm thinking would keep the weight down:

- 9mm upper drilled for gas tube (flat top, no forward assist/brass defelctor)
- NDS black A1 lower (lighter due to less material around the A2 reinforcement areas)
- Semi auto carrier (less material than an auto carrier)
- Light rear BUIS (lots of options here)
- 14.5" lightweight barrel with pinned flash hider (not sure which model yet based on weight, perhaps extended A1)
- 6 position receiver extension (more holes = more material removed) with fiberlite type stock
- Standard carbine handguards and A1 pistol grip

I would probably go with a fixed FSB for durability purposes, although there are lighter weight gas block options.

I think in the end this would make for a very light carbine that still retains features that I prefer such as aluminum alloy receivers , traditional type stocks, and a fixed FSB.
TCBA_Joe
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Posted: 7/25/2011 1:09:15 PM
I don't think the guy is looking for the ultimate lightweight carbine, just trying to keep the weight down on a standard carbine.
Please, call me Joe

There is definitely something perverse about two men who carry guns 24/7 being so happy that others are giving theirs up. -happycynic
pun
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Posted: 7/25/2011 1:17:03 PM
Lightweight barrel no rails get a light mount thats bayo lug mounted and then with your flat top you can have an Aimpoint a BUIS and the light I use Lancer L5 Magazines.
Unicorn
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Posted: 7/25/2011 3:46:31 PM
A TRX tube, or a Daniel Defense Light rail is going to be about the same weight as standard M4 handguards when you add the heavier barrel nut, delta ring assembly and hand guard caps. Using a longer rail and chopping the front sight base or using a low pro gas block will reduce weight even more. An Aimpoint Micro and mount can't be much more than the big chunk of aluminum in the carry handle and sight.

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cjk1
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Posted: 7/26/2011 12:18:42 AM
[Last Edit: 7/26/2011 8:56:12 PM by cjk1]
Originally Posted By cjk1:
I've got a a USAF GUU-5/P clone that is pretty light, and was even lighter when it still had its lightweight barrel.

...but I've been planning an ultralight build for some time though, and here are some of the features that I'm thinking would keep the weight down:

- 9mm upper drilled for gas tube (flat top, no forward assist/brass defelctor)
- NDS black A1 lower (lighter due to less material around the A2 reinforcement areas)
- Semi auto carrier (less material than an auto carrier)
- Light rear BUIS (lots of options here)
- 14.5" lightweight barrel with pinned flash hider (not sure which model yet based on weight, perhaps extended A1)
- 6 position receiver extension (more holes = more material removed) with fiberlite type stock
- Standard carbine handguards and A1 pistol grip

I would probably go with a fixed FSB for durability purposes, although there are lighter weight gas block options.

I think in the end this would make for a very light carbine that still retains features that I prefer such as aluminum alloy receivers , traditional type stocks, and a fixed FSB.


Here's a bad paint rendition of what I'm talking about. It's a modified image of a factory Colt




hmaverick
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Posted: 7/26/2011 12:41:11 AM
Originally Posted By TCBA_Joe:
I don't think the guy is looking for the ultimate lightweight carbine, just trying to keep the weight down on a standard carbine.


Then why is the title "lightest AR 15 ever"?
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