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Old 04-26-2013, 22:29   #1
FireForged
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lightest upper

So what is the lightest complete upper that is actually worth a darn. My 1999 Bushmaster 16" Hbar is beginning to feel heavier than I remember.
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Old 04-26-2013, 23:02   #2
Cole125
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Hard to beat the BCM 16 inch mid length light weight upper.
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Old 04-26-2013, 23:07   #3
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That was 14 years ago. Chinups, pushups, sprints, repeat. Otherwise write a check for $1k+ and get a Daniel Defense pencil upper with the MFR rail, or Palmetto State Armory knockoff (still good stuff).
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Old 04-27-2013, 05:32   #4
faawrenchbndr
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Quote:
Originally Posted by FireForged View Post
So what is the lightest complete upper that is actually worth a darn. My 1999 Bushmaster 16" Hbar is beginning to feel heavier than I remember.
A simple barrel change would be the best option.
Look for a light weight profiled mid length gas barrel
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Old 04-27-2013, 07:55   #5
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After lugging around an HBAR you’re going to be happy with any gov or LW profile. Just find one from a quality company.
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Old 04-27-2013, 09:51   #6
FireForged
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I was thinking a carbine length rather an mid length. Is there a reason you guys all suggest mid length. If its a recoil thing, I don't mind it in a 556.

Quote:
That was 14 years ago. Chinups, pushups, sprints, repeat
LOL, yes you 100% correct. Old age catches up with each of us and by that time we are too grumpy to do pushups during commercials like we used to. I settle for a slow jog around the block(.8mile) 3x a week and then sit on the porch drinking tea and waving at folks as they pass on tractors.
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Old 04-27-2013, 10:00   #7
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Quote:
Originally Posted by FireForged View Post
I was thinking a carbine length rather an mid length. Is there a reason you guys all suggest mid length. If its a recoil thing, I don't mind it in a 556.



LOL, yes you 100% correct. Old age catches up with each of us and by that time we are too grumpy to do pushups during commercials like we used to. I settle for a slow jog around the block(.8mile) 3x a week and then sit on the porch drinking tea.
Longer sight radius, longer handguard, slightly less recoil (arguable, though), and a little less wear and tear on the bolt group.
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Old 04-27-2013, 14:40   #8
Cole125
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Quote:
Originally Posted by FireForged View Post
I was thinking a carbine length rather an mid length. Is there a reason you guys all suggest mid length. If its a recoil thing, I don't mind it in a 556..
Look at mid length gas systems as a "fine tuned" AR. It just runs smoother, less violent BCG action.
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Old 04-28-2013, 07:36   #9
MarkCO
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We use a Nordic 16" mid-length gas barrel with a Carbon Feather handguard, JP LMOS BCG, delrin plug in the FA port, Nordic Corvette comp to build 5 pound ARs that still shoot 1MOA.
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Old 04-28-2013, 09:13   #10
txleapd
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Quote:
Originally Posted by FireForged View Post
Is there a reason you guys all suggest mid length.
The mid-length upper has a longer gas system and the front sight housing is 2" forward as to the location of the carbine length gas system.

When talking about the different gas systems on a 16" barrel, think about the distance from the gas hole to the end of the barrel. The longer that the bullet is in the barrel after the bullet passes the gas hole, the more gas that is getting pushed back through the gas tube and back into the gas key. The end result is a sharper recoil impulse.

This is why on a 16" barrel, a mid-length gas system is slightly smoother than a carbine length gas system.

The distance from the gas hole to the end of the A2 flash hider on a 16" barrel with carbine-length gas system is approximatley 9.5".

The distance from the gas hole to the end of the A2 flash hider on a 20" barrel with rifle length gas system is approximatley 7.5"

The distance from the gas hole to the end of the A2 flash hider on a 16" barrel with mid-length gas system is approximatley 7.5"

The distance from the gas hole to the end of the A2 flash hider on a 14.5" barrel with carbine-length gas system is approximatley 7.5"

The 20" barrel with rifle length gas system, 16" barrel with mid-length gas system, and 14.5" barrel with carbine length gas system all have the same amount of dwell time (distance from the gas hole to the end of the barrel).

The 16" barrel with the carbine length gas system has a dwell time that is approximtely 1.5" longer. Thus it's pumping more gas into the bolt carrier key, forcing it back hard, etc. The 16" barrel with the carbine length gas system is harder on parts over the long term and you'll feel slightly more recoil impulse.
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