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Posted: 7/24/2014 12:23:05 PM EDT
[#1]
I built what I voted for. Paid the $200 for a stamp too. |
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Posted: 7/24/2014 12:23:49 PM EDT
[#2]
11.5" barrel and 4.5" will equal SBR not 16"+ Just a thought
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Posted: 7/24/2014 12:25:31 PM EDT
[#3]
Quote HistoryQuoted:
11.5" barrel and 4.5" will equal SBR not 16"+ Just a thought Good point. Maybe I should edit it to say 11.7" barrel. Not sure I want to trouble with an SBR |
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Posted: 7/24/2014 12:33:20 PM EDT
[#4]
Which model of carbine are you building? That has a lot to do with which barrel to use. If it is a GAU-5A, it uses a 11.5" pencil barrel with a 4.5" moderator (SBR). If you are building GAU-5A/A, it uses a 14.5" pencil barrel with a 4.5" moderator w/ grenade ring.
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Posted: 7/24/2014 12:36:05 PM EDT
[#5]
Quote HistoryQuoted:
Good point. Maybe I should edit it to say 11.7" barrel. Not sure I want to trouble with an SBR Quote HistoryQuoted:
Quoted:
11.5" barrel and 4.5" will equal SBR not 16"+ Just a thought Good point. Maybe I should edit it to say 11.7" barrel. Not sure I want to trouble with an SBR You would really need to go with a 12.5"-12.75" barrel length. 12.5" barrel with a pinned and welded 4.5" moderator with grenade ring will give you about 16.1" OAL. |
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Posted: 7/24/2014 2:17:54 PM EDT
[#6]
Voted for the oldie with the Brick moderator, but one of each, except that 16" M4, is okay.
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Posted: 7/24/2014 7:44:11 PM EDT
[#7]
Quote HistoryQuoted:
Which model of carbine are you building? That has a lot to do with which barrel to use. If it is a GAU-5A, it uses a 11.5" pencil barrel with a 4.5" moderator (SBR). If you are building GAU-5A/A, it uses a 14.5" pencil barrel with a 4.5" moderator w/ grenade ring. I guess that is really my question. I like to have variety since I know I can't expect to build EVERY model. Its not like I am John Thomas, Riggs, Boywonder, or some other Retro insane guy! 
Current carbines already include 2 with pencil barrel, one with moderator and grenade ring, and one with M4 14.5" barrel. So if I wanted to go somewhat different, I could do the brick moderator with no grenade ring although I would do the 16.1 oal. I guess the M4 barrel is different enough too. So thats really the choice I think at this point. |
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Posted: 7/24/2014 8:24:25 PM EDT
[#8]
Depending on the source...
GAU-5A is the 610, 10" barrel; 4.5" moderator or 630, 11.5" barrel; 4.5" moderator. GAU-5A/A is the 649, 11.5" barrel; 4.5" moderator. Those guns upgraded to a 14.5" barrel are GAU-5P. If the twist is 1:7 then it's GUU-5P. Both the GAU-5P and GUU-5P have been seen overstamped on GAU-5A, GAU-5A/A, XM177, XM177E1 and XM177E2. Sky's the limit with the USAF carbine! |
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Posted: 7/24/2014 8:26:30 PM EDT
[#9]
Build one of each. Duh. What'd you expect me to say?
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Posted: 7/24/2014 8:43:03 PM EDT
[#10]
EVERY time I try to use a M4 barrel for a fixed carry handle upper, I end up with 14.5" 653 or 723 barrels....and 603 604 or c7 uppers.....and I REALLY want a 727,........
True story. |
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Posted: 7/25/2014 7:03:55 AM EDT
[#12]
Quote HistoryQuoted:
If you are not stuck on the AF models and want to use a 14.5" M4 profile barrel, you may want to consider a late model 723 or a 727. Well, they used them too, so technically, unless the OP was going to engrave them, they WOULD be AF models.  Combat controllers and PJs used quite a variety of weapons.
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Posted: 7/25/2014 8:19:57 AM EDT
[#13]
Quote HistoryQuoted:
Well, they used them too, so technically, unless the OP was going to engrave them, they WOULD be AF models. Combat controllers and PJs used quite a variety of weapons.
Quote HistoryQuoted:
Quoted:
If you are not stuck on the AF models and want to use a 14.5" M4 profile barrel, you may want to consider a late model 723 or a 727. Well, they used them too, so technically, unless the OP was going to engrave them, they WOULD be AF models. Combat controllers and PJs used quite a variety of weapons.
I did not know that. On this build I already have a 604 upper so will be sticking with it. I do like the 723 though - But I really CAN'T start any new builds! 
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Posted: 7/26/2014 8:10:53 AM EDT
[#14]
So, what's this thing going to look like??
 My XM177E2 clone has been under construction since 2008.
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