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m118sb
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Posted: 12/6/2010 4:03:13 PM EST
[Last Edit: 12/14/2010 8:22:21 AM EST by m118sb]
I'm waiting on my ACR barrel to come back from ADCO. I requested the barrel be profiled forward of the gas block, cut back with an AAC Phantom mount pinned to legal length. I don't have delusions that it will null out six pounds of weight but I want to bring back the added length and weight of the can. I've seen where folks ask about weights before/after so I took some measurements and figured I'd post 'em up if anyone else might be interested. I took the weights of different flash hiders I had around for comparison so that if you'd rather use a different muzzle device you'd have something to compare to by subtracting the weight of the AAC I used and then adding the appropriate numbers. It'd be a matter of ounces but for the sake of completeness. I only did the ones that would compare to the same length of barrel. They are listed in metric (kilograms [kg] or grams [g]) and standard (pounds [lb] and ounces [oz]).


ACR barrel (complete), 16", w/ A2 flash hider
1.175kg // 2lb 9 3/8oz

ACR barrel, modified as above
1.081kg // 2lb 6 1/8oz


Flash hiders

AAC 18T Phantom mount
98g // 3 1/2oz

AAC 18T Blackout mount
124g // 4 3/8oz

Vortex
88g // 3 1/8oz

YHM Phantom
64g // 2 1/4oz

YHM 5C2 Phantom
59g // 2 1/8oz
SilentType
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Posted: 12/7/2010 9:09:36 AM EST
Ruger shaved more than a half pound off front weight off the SR556 C by going with a flutted barrel. The ACR should do the same thing. If you could get a flutted barrel and cut it down with a pinned flash hider at exactly 16" then that would be a pretty fair weight saving I would think.

m118sb
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Posted: 12/7/2010 5:39:34 PM EST
It's a pretty typical M4 pattern barrel except in mid length gas obviously. Under the handguard it's a pretty light contour except for the gas block shoulder could probably be reduced quite a bit. Turning down the diameter of the heavier forward section and cutting back the barrel is about the best way to shave the most weight and lighten the load from being so far forward and awkward.
m118sb
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Posted: 12/14/2010 8:25:20 AM EST
Weight reduction was 3 1/4oz, so shy of a 1/4lb.

Original post edited above. Pic to follow.
SilentType
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Posted: 12/14/2010 10:43:43 AM EST

Originally Posted By m118sb:
Weight reduction was 3 1/4oz, so shy of a 1/4lb.

Original post edited above. Pic to follow.


Very nice. 1/4 lb is nothing to sneez at.

That should make a positive difference.
Stuka_Pirate
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Posted: 12/14/2010 4:24:02 PM EST
...and now will it react like the Colt M4 shorty projects to barrel profile change with FTF's?
Regarding DLoken: Retards are tenacious. Ever see one make macaroni art? They go at it like a fucking machine, man. ~~ Swingset.
m118sb
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Posted: 12/14/2010 5:48:56 PM EST
Originally Posted By Stuka_Pirate:
...and now will it react like the Colt M4 shorty projects to barrel profile change with FTF's?


Don't know but I'm wagering a guess it won't matter much either way since there is still plenty of barrel beyond the gas port. I still need to get out and shoot it of course now that I've had the work done but it ran like a raped ape before. If it did mess with the voodoo any then it will be easy to spot. Worst case there is enough room to move the gas block and start tweaking port sizes.