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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 10-25-2010, 1:28 PM
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Cool Who has the lightest AR-15 Rifle?

I love light and simple. Presently I am machining some weight out of the scope mount to bring down the weight. Who has the lightest AR-15 Rifle? And what is your setup? Pic always appreciated.

Assumptions;
rifle only
16" barrel or longer
no mag
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  #2  
Old 10-25-2010, 3:58 PM
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I'm not really into the AR platform, but a super light one does interest me. I plan to build one some day using a Plum Crazy lower, and a BCM lightweight midlength upper. I figure it will weigh just under 5 pounds, or maybe a touch over.
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  #3  
Old 10-25-2010, 4:08 PM
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Not mine lol, with eotech, I'm probably at 8lb something. Haven't weighed it in yet.
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  #4  
Old 10-25-2010, 5:46 PM
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Quote:
Originally Posted by cyrus View Post
I love light and simple. Presently I am machining some weight out of the scope mount to bring down the weight. Who has the lightest AR-15 Rifle? And what is your setup? Pic always appreciated.

Assumptions;
rifle only
16" barrel or longer
no mag
See http://www.calguns.net/calgunforum/s...d.php?t=350069
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  #5  
Old 10-25-2010, 6:06 PM
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Bushmaster Carbon-15 Top Loader
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  #6  
Old 10-25-2010, 6:28 PM
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My noveske basic is very light.
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  #7  
Old 10-25-2010, 6:36 PM
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The lightest I have ever heard of....

http://www.bushmaster.com/catalog_xm...C1516SLORC.asp

carbon fiber upper and lower.
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  #8  
Old 10-25-2010, 6:50 PM
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It's not the lightest, but I did build this up with weight in mind. I took a few compromises to make the rifle very useful for me, but to save weight at the same time. It's EXACTLY 7 pounds:

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  #9  
Old 10-25-2010, 6:56 PM
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Quote:
Originally Posted by bdsmchs View Post
It's not the lightest, but I did build this up with weight in mind. I took a few compromises to make the rifle very useful for me, but to save weight at the same time. It's EXACTLY 7 pounds:

Thats a nice rifle. I had one EXACTLY like it (LMT) but i had to sell it. I saved the moe handguards and lmt rear sight for the future. Anyways, what kind of upper did you use? I want to build another similar but Im going to use the BCM 14.5 lightweight upper and a calvarly arms lower assembly. That should be very light.
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  #10  
Old 10-25-2010, 6:58 PM
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How much does that rear sight weight..??
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  #11  
Old 10-25-2010, 6:58 PM
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this one is light...14.5 bbl

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  #12  
Old 10-25-2010, 7:00 PM
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Quote:
Originally Posted by supermario View Post
Thats a nice rifle. I had one EXACTLY like it (LMT) but i had to sell it. I saved the moe handguards and lmt rear sight for the future. Anyways, what kind of upper did you use? I want to build another similar but Im going to use the BCM 14.5 lightweight upper and a calvarly arms lower assembly. That should be very light.
The rifle shipped as a factory Daniel Defense XV.

Sold the rear sight here in the marketplace to replace with the LMT rear. Got the MOE stock and MOE handguards for free. Bought the MOE grip, enhanced buttpad and Vortex.
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  #13  
Old 10-25-2010, 7:01 PM
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Quote:
Originally Posted by Trendkill View Post
How much does that rear sight weight..??
I'm not sure. Maybe 2-3 oz?
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  #14  
Old 10-25-2010, 7:03 PM
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Quote:
Originally Posted by Trendkill View Post
How much does that rear sight weight..??
I just weighed it on a small food scale, it read 4.5 oz. Im not sure how accurate it is but that a ballpark figure. Its a hefty sight but I love them becus they feel rock solid.

How much does your Ar weigh with that flip up and rail?
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  #15  
Old 10-25-2010, 7:15 PM
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Plum crazy lower with a ight barrel is going to kill everything for weight loss. Thats my next build.
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  #16  
Old 10-25-2010, 8:09 PM
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I didn't plan on having my AR be lightweight... DD AR 15 Lite Rail 9.5 FSP, Adams Arms Piston Kit, Eotech, AEG Arms Bipod Grip, medium profile 16" barrel, etc.

Would I build a lightweight? My next AR is likely going to be .308, so probably not.
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  #17  
Old 10-25-2010, 8:21 PM
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6lbs 7oz (without mag) and a pleasure to shoot.
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  #18  
Old 10-25-2010, 8:21 PM
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Quote:
Originally Posted by bdsmchs View Post
Mine kinda looks like that, except it's a piston LWRC M6 with M4 barrel, phamtom flash and CTR stock, otherwise it's identical, the piston probably add 4-6 ozs
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  #19  
Old 10-25-2010, 8:56 PM
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Quote:
Originally Posted by Deadon View Post
Plum crazy lower with a ight barrel is going to kill everything for weight loss. Thats my next build.
Willing to make a wager?

I've got a lean, mean AR57 that will smoke everyone's lightweight build!

AR57 with a 10/50mag, and an Aimpoint H1...


4.95lbs.
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  #20  
Old 10-25-2010, 9:17 PM
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Quote:
Originally Posted by supermario View Post
How much does your Ar weigh with that flip up and rail?
I'll check.....
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.......No not a Knights In Satans Service rifle lol.
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  #21  
Old 10-25-2010, 9:27 PM
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Ok.....7 lbs on the nose. Considering what it has....thats pretty damn good.
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I didn't miss the bend-over-party every time a friend wanted to get in my back seat. . .
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.......No not a Knights In Satans Service rifle lol.
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  #22  
Old 10-25-2010, 9:48 PM
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I'll let you know friday when the BCM lightweight middy and my MOE handguards arrive. Its going on a featureless lower with an ACE Ultralite stock and Hammerhead grip. My compromises on weight savings v.s. functionality come in the form of a KAC ambi mag release, since im a lefty, makes it nice.
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  #23  
Old 10-25-2010, 10:19 PM
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am i going to have to post this again?

my lightest (as shown):
- 16" barrel
- rifle length rail
- aimpoint T-1

6 pounds, 10 ounces, with no mag.

without the optic and mount, it weighs in at 6 pounds, 4 ounces.



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  #24  
Old 10-25-2010, 10:41 PM
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Originally Posted by pacrimguru View Post
am i going to have to post this again?

my lightest (as shown):
- 16" barrel
- rifle length rail
- aimpoint T-1

6 pounds, 10 ounces, with no mag.

without the optic and mount, it weighs in at 6 pounds, 4 ounces.
Checked out your signature links. I saw that this same build but with a SOPMOD weighed in at 8lbs 2oz? Is there really a 1lb 14oz difference between the Modstock and the SOPMOD or is there something else omitted from this current build that was on the previous config?
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Old 10-25-2010, 10:50 PM
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that build in my sig also has a X300 and XT07 switch on it. together with the light, the SOPMOD, an empty 10/30 pamg, and the switch, the carbine weighed in a lot more. what you see in my AR profile is an entirely different upper actually. this one shown here is built on a "KAC Special Run" upper that weighs less than the standard upper receiver due to an integrally mounted rear BUIS.
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  #26  
Old 10-25-2010, 11:01 PM
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Originally Posted by pacrimguru View Post
that build in my sig also has a X300 and XT07 switch on it. together with the light, the SOPMOD, an empty 10/30 pamg, and the switch, the carbine weighed in a lot more. what you see in my AR profile is an entirely different upper actually. this one shown here is built on a "KAC Special Run" upper that weighs less than the standard upper receiver due to an integrally mounted rear BUIS.
Ahh ok, I missed the light and switch on the previous build. PM inbound with another question, don't want to thread jack that one.

Thanks!
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Old 10-25-2010, 11:06 PM
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Plain Jane is the lightest, just like it came when you pulled it out of the box.

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  #28  
Old 10-25-2010, 11:13 PM
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Quote:
Originally Posted by pacrimguru View Post
am i going to have to post this again?

my lightest (as shown):
- 16" barrel
- rifle length rail
- aimpoint T-1

6 pounds, 10 ounces, with no mag.

without the optic and mount, it weighs in at 6 pounds, 4 ounces.



How much invested?
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  #29  
Old 10-25-2010, 11:16 PM
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a lot. haha... that set up you see there is about 3k i'm guessing.
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Old 10-25-2010, 11:55 PM
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5.5 lbs
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  #31  
Old 10-26-2010, 12:34 AM
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Quote:
Originally Posted by pacrimguru View Post
am i going to have to post this again?

my lightest (as shown):
- 16" barrel
- rifle length rail
- aimpoint T-1

6 pounds, 10 ounces, with no mag.

without the optic and mount, it weighs in at 6 pounds, 4 ounces.



What stock is that again?
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  #32  
Old 10-26-2010, 12:39 AM
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What stock is that again?
Vltor Modstock
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  #33  
Old 10-26-2010, 1:23 PM
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Quote:
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5.5 lbs
Airsoft..???
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  #34  
Old 10-26-2010, 1:28 PM
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I don't think it is airsoft. We have one in the shop and the dust cover doesn't open and show a carrier like that and why would he put that grip on an airsolf.

I could be wrong.
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  #35  
Old 10-26-2010, 1:32 PM
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7lbs, but my scope weight 1.5lbs
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  #36  
Old 10-26-2010, 1:36 PM
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Quote:
Originally Posted by Trendkill View Post
Airsoft..???
Who wants to put a MMG ON THEIR AIRSOFT?? lol.
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  #37  
Old 10-26-2010, 1:38 PM
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Originally Posted by Trendkill View Post
Airsoft..???
No, it is real. He is using the Slick Side A1 Upper like the USAF uses. A lot of people have never seen those before, especially new guys. My issued GAU-5 had that Upper.

The lightest overall finished rifle would be something like that, but with a pencil barrel instead of an M4 barrel. To make it even lighter you could use a Plum Crazy carbon fiber lower. But I prefer metal.

Something like this...



The GAU-5 I was issued had an 11.5" barrel, which would be even lighter. But the only way to legally build a clone of that would be to build it as an AR Pistol. Which at one point I did, but I sold it to fund another project.



I really like the old school light weight rifles. They are great for running and gunning. Rails and long hand guards are nice too, but when weight is an issue Old School is the way to go! On hour 8 of a long hard day of training, you really begin to appriciate the lighter rifle.

Last edited by tacticalcity; 10-26-2010 at 2:05 PM..
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  #38  
Old 10-26-2010, 1:48 PM
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6lbs 9oz empty and its a gas piston AR which are said to be heavier? (Stag Model 8)
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  #39  
Old 10-26-2010, 2:15 PM
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Default You will need a carbon fiber barrel for sure

I have been researching carbon fiber barrels (I can get pretty obsessive once I get going) and the concept sounds very very exciting. In a sense, if done correctly, the carbon wrapped barrel gives you the best of both worlds in regards to accuracy and weight. The density of carbon composite is 1/4 of steel, yet it is stiffer (by far) stronger and, if the correct fiber is used in the correct orientation, the carbon barrel conducts heat much much better than steel so the inside temperature of the barrel will be lower when doing a lot of shooting (and thereby extending barrel life). It is a pretty rare thing in engineering design where you get only positive results from a choice, rather than compromising one specification for another. About the only downside of carbon wrapped barrels is the cost, but even that is not astronomically high. ABS charges about $800 for a complete chambered barrel, which is only a bit higher than a top end steel barrel.

The weight savings can range anywhere from huge, if you are using a long bull barrel for extreme accuracy, to somewhat less significant on a gun where accuracy wasn't a huge concern so the barrel was already pretty light. In theory you could have a long bull barrel (for max muzzle velocity and accuracy) with the weight of a lightweight short barrel, or a really lightweight carbine that could still shoot as accurately as a heavy bull barrel gun.

There are still some issues with these carbon barrels though. Not everyone making or selling them is doing them the same way so not all carbon barrels will perform the same. If you get one from someone who doesn't know what they are doing the carbon wrap can hurt both accuracy (due to significantly different coefficient of thermal expansion of carbon vs. the steel liner) and barrel cooling (the correct fiber must be used and must be oriented correctly).
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  #40  
Old 10-26-2010, 7:16 PM
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Quote:
Originally Posted by tacticalcity View Post
No, it is real. He is using the Slick Side A1 Upper like the USAF uses. A lot of people have never seen those before, especially new guys. My issued GAU-5 had that Upper.
the GAU-5 was kind of the inspiration for my rifle, I wanted a lightweight barrel but it was a pain to get one in 14.5/chome for a decent price.

With a pencil barrel, DD lite rail and a plum crazy lower it would probably be in the 4.25-4.5 lb range.
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