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Beelzibub
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Posted: 5/3/2010 11:51:37 PM
So are there any real advantages other than nostalgia having a barrel OD of 0.625" for the gas block mount rather than what seems more common at 0.750"? I'm on the fence between waiting for the 16" LW Middy with the 0.625" gas block diameter later this year or just getting the current 16" LW Middy upper with the 0.750" diameter!
SOC
Modular rifle? I'll show you a modular rifle.
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Posted: 5/4/2010 12:05:40 AM
[Last Edit: 5/4/2010 12:07:30 AM by SOC]
.625 gives you a continuous barrel profile that is light.

If you decide to modify the gas block (drill and tap for an allen to make it adjustable) there is more material in supporting arias.



A free floated .625 continuous profile barrel is what I prefer on a general use AR-15 carbine for use at ranges from 0-500 yards.

I'm actually sending in 7 of the barrels I use on my MGI to ADCO (most are M4 profile) to have them turned down to .625.
"Never seen a gun I couldn't make improvements to."
BravoCompanyUSA
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Posted: 5/4/2010 7:49:44 AM
Originally Posted By Beelzibub:
So are there any real advantages other than nostalgia having a barrel OD of 0.625" for the gas block mount rather than what seems more common at 0.750"? I'm on the fence between waiting for the 16" LW Middy with the 0.625" gas block diameter later this year or just getting the current 16" LW Middy upper with the 0.750" diameter!


Pros: It may be 1oz lighter ?
Cons: A lot less aftermarket gas block/front sight options.
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Beelzibub
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Posted: 5/4/2010 1:28:04 PM
[Last Edit: 5/4/2010 1:39:07 PM by Beelzibub]
Bravo:
I thought about the weight difference, but then after looking over the small selection of 0.625" gas blocks available I realized that the material removed from the barrel would essentially still be present in the gas block bore which would negate the weight savings. Many of the .625 gas blocks I could find have a .750 counterpart, which in all likelihood means that they are the exact same parts only with different bore sizes!
Beelzibub
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Posted: 5/4/2010 1:38:37 PM
[Last Edit: 5/4/2010 1:39:26 PM by Beelzibub]
SOC:
I apologize in advance if I ask basic questions, I'm new to the AR platform so I'm still learning as I go! I wasn't aware that the gas block can be made adjustable. Is this basically used to "fine tune" the gas system timing for a specific configuration? My intended use for this gun is recreational shooting and eventually some fun competition (3-gun, etc).
BravoCompanyUSA
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Posted: 5/4/2010 1:50:29 PM
Originally Posted By Beelzibub:
Bravo:
I thought about the weight difference, but then after looking over the small selection of 0.625" gas blocks available I realized that the material removed from the barrel would essentially still be present in the gas block bore which would negate the weight savings. Many of the .625 gas blocks I could find have a .750 counterpart, which in all likelihood means that they are the exact same parts only with different bore sizes!


Good point! There probably is not really any net weight saving between the two different set ups.
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BravoCompanyUSA
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Posted: 5/4/2010 1:51:27 PM
Originally Posted By Beelzibub:
SOC:
I apologize in advance if I ask basic questions, I'm new to the AR platform so I'm still learning as I go! I wasn't aware that the gas block can be made adjustable. Is this basically used to "fine tune" the gas system timing for a specific configuration? My intended use for this gun is recreational shooting and eventually some fun competition (3-gun, etc).


Exactly correct. It is a set up for a competition rifle.
You can adjust the gas to your load, buffer, etc.

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kitteh
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Posted: 5/4/2010 8:33:07 PM
When the Lightweight barrels were announced, I was disappointed when I found out they would not be in .625 gas blocks.

Changed my mind. The gas blocks I wanted to use (Vltor VST-1) only come in .750"; I contacted Vltor and they said they will not make any .625" versions.

Please BCM stick to .750".