Posted: 2/25/2006 6:35:29 PM EDT
| Greetings. Having a 6920, I still recall how light our M16s were. What Colt is the lightest? Is there a significant weight difference between the 6520 and 6920? |
Could the MT6400 be heavy under the handguards? That 1.35 pounds difference is hard to find. |
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How about the R6530? Described as a lightweight carbine. eta: Also, will a full stock always weight more than the adjustable option? What would be the weight difference? |
It is a recent production LE model with 4-position collapseable stock and thin handguards. I have kept it bone stock except for the addition of a Tango Down pistol grip and TA44R-2 ACOG. 
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Nice setup; lightweight, 1:7 twist, ACOG. If you don't already, consider a vortex for the occasional night shooting.
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6933 If you mean non-NFA and currently available, I'd bet on the 6520 Here's my two lightweights |
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Oh, and from the Colt site 6520: 5.8 lbs R0977: 5.9 lbs (14.5" barrel version of 6920) |
R6001 (discontinued) - 5.80 Pounds www.biggerhammer.net/ar15/variants/ |
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Quoted: Nice setup; lightweight, 1:7 twist, ACOG. If you don't already, consider a vortex for the occasional night shooting. I currently have a vortex on my 6721 recce-ish carbine. I found the additional weight of the H-bar a bit prohibitive for carry purposes so I turned it into more of bench rest shooter by adding a D.D. 12.0 rail w/ LaRue lo-pro gas block, Harris bipod and TAO1-NSN ACOG w/ Troy BUIS'. It is an absolute tack driver in that configuration. I have both read and heard that the Vortex will improve accuracy/groupings and I can certainly say that it does not degrade them. It does appear to be somewhat louder than a standard A2 hider. 
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Here's my two lightweights Kudos on the flat-top 6520!! That might be the ultimate lightweight configuration. 
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I can't wait to get the two of them on a scale and see what the difference is. |
Never heard of a Flat-Top R6520 or AR6520. Got anymore info? |
You have to make one. I bought a Colt 6920 stripped upper and had ADCO change it out when they installed the DD rail. That's the reason for the DD 9.0 and the Troy front BUIS. Ideal for me would have been to retain the stock FSB and use a DD 9.5 FSP, but without the "F" marked FSB I couldn't guarantee my rear BUIS would work out. It's not so bad though, the shaved FSB and Troy combined weigh less than the stock FSB alone. |
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Bushmaster Carbon-15 Carbine claimed weight w/o Magazine - 5.77 lbs Colt LE6520 Carbine w/o Magazine - 5.8 lbs And the MSRP is virtually the same. Don't need no stinking Carbon-15! |
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Team Member YardDog1 has a couple of Colts rollmarked "Lightweight". Not sure of the model number. It uses the pencil barrel. This is not his, but marked like this. (Courtesy of _DR's Lower Receiver & Mag Floorplates, Logos..etc Thread) --> LINK 
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I could have purchased one of those Lightweight lowers complete with A2 stock for $325.00 a couple of months ago. Like most deals....I was a day late and a dollar short...LOL 
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These are 6320 lowers. I got a new one from SAW for $400 a while back. The lightweight barrel was 1/9 twist. No more of these available (new from SAW, anyway). Thanks, Mark |
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How many Colt barrel contours are there? More than these? Standard Original thin barrel style. A2 Later style of barrel that was tapered at the front sight to thicken the exposed barrel. HBAR Same thickness the enitre length through, rather than just the exposed section. Stepped HBAR M203 launcher cuts or steps. |
No expert, but from memory........... Government Profile Lightweight. (pencil) M4 (I guess what you label as stepped) M4 is light under HG, .650 (IIRC) at FSB, stepped for M203, and stepped up forward that. There is also a Heavy version of the M4 that is heavy under the HG There is a stainless 24" used and may have its own unique profile and maybe even a Bull barrel Check w/ Ekie, or AR15barrels.com (Randall Rausch?) 
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Ekie, That's what I was thinking, and you confirmed it. I wonder what the weight difference would be between a full and a collapsible stock?
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Depends on the stock, there are many variation of those too. The original green painted fiberglass buttstocks are pretty light.
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