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Ekie
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Posted: 9/21/2006 1:47:16 AM
[Last Edit: 6/3/2007 9:48:17 PM by Ekie]
Am excluding the GUU series, while largely made of Colt parts they are not a factory item. Will add the MK18 MOD 0 later on.

Uppers:

607

USGI GX5857 Colt Model 607, these carbine are US PROP marked found in the 14,500-14,916 serial number range, and roll marked GX5857. These were made up as part of the 1965 S.A.W.S. contract (photo by Tokoi):



609

USGI M177E1/CAR-15/Commando, these carbine are US PROP marked found in the 900,000-909,999 serial number range, and roll marked COMMANDO. First deliveries occured in Nov of 1966, and issue in Vietnam was completed by March of 1967:

NO PIC

610

US Air Force GAU-5/A/CAR-15/Commando, these carbine are US PROP marked found in the 900,000-909,999 serial number range, and roll marked GAU-5/A. First deliveries occured in Nov of 1966, and production was completed by the Spring of 1967:



629

USGI XM177E2, commonly referred to as a “CAR-15” or “Commando” 1967-1970, these carbine are US PROP marked found in the 900,000-909,999 serial number range, and roll marked XM177E2. After US military production ceased in 1970 Colt continued to manufacture an export version of this Carbine as the Model 639:



649

US Air Force GAU-5/A/A, commonly referred to as a “CAR-15” or “Commando” 1967-1970, these carbine are US PROP marked found in the 900,000-909,999 serial number range, and roll marked GAU-5/A/A. GAU-5/A/A Carbines, or an export version with SINGLEPOINT optics were used in the Son Tay raid:



653

Commonly referred to as a M16A1 Carbine, slang as "CAR-15", nine million serial number range, 1971-1984?:



723

Commonly referred to as a M16A2 Carbine, slang as "CAR-15", 8 million serial number range, 1984-?:



723 with A2 profile barrel and M203 cut

Commonly referred to as a M16A2 Carbine, slang as "CAR-15" or "M4", 8 million serial number range, 1987-?:



727

Commonly referred to as a M16A2 Carbine, slang as a "CAR-15" or "M4", 8 million serial number range, 1988-1993:



733

Commonly referred to as a "Commando", 8 million serial number range 1984-1993?:



920

USGI M4 Carbine, W serial number prefix, US PROP marked, 1994-current:



921

USGI M4A1 Carbine, W serial number prefix, US PROP marked, 1994-current:



921HB

USGI M4A1 Carbine with heavy barrel, W prefix serial number, US PROP marked, deliveries beginning as early as January of 2001, to current:



933

Commonly referred to as a “Commando”, A serial number prefix 1992-current (might pull this one, not sure they were ever issued):



Parts guide:

Keep in mind that Colt used up quite a supply of 600 series parts on early 700 series Carbines. For example, just because a 723 should have a delta handguard ring don't mean that it will, because quite a few were sent out from the factory with the older slip ring.

3.5” 607 moderator (photo by Ordnance):



4.5” moderator used on the 607/GAU-5/A/GAU-5/A/A/XM177E1/E2 (Total Silence reproduction):



When the “grenade ring” is installed correctly it covers the lock washer (GAU-5/A/A and XM177E2 only):



Bird cage flash suppressor used on the 653:



A2 flash suppressor used on the 700 and 900 series:



Early lock washer on left, as used on the 600 series. Middle is the A2 peel washers used to time the A2 flash suppressor to TDC on the 700 series, and early M4/A1’s. Right is the current crush washer used on the M4/A1 starting in 2000:



M VP marking found on the 607 (photo by Ordnance):



GAU-5/A/XM177E1 barrel marked MP on right side of the barrel (photo by ranchhand):



We only have one GAU-5/A/XM177E1 example and it has the following numbers stamped on it (photos by ranchhand):





GAU-5/A/A/XM177E2 barrel marked C MP C. C meaning Colt, M meaning Magnetic particle inspected, P standing for Proofed, and the C marking indicates a chrome chamber.



Early 653 barrels were marked C MP B, the B meaning chrome Bore, and they were 1/12.:



Starting in 1974 653 chrome bores were marked C MP CHROME BORE. This marking was also used on early 1/7 twist 723's barrels:



Early on 723 barrel markings were changed from that used on the prior 653. The C MP marking means the same as before. The NATO 1/7 specifies the rifle is designed for NATO standard ammo rather then M193 as used with the 653:



733 barrel markings, the CB meaning Chrome Bore:



727 barrels have the same codes as M16A2 barrels, but are in two rows, and the C is in parenthesis (Note that some 723's use this same marking):



M4/A1 barrels are marked similar to 727 barrels:



Starting as early as 1989 a single or two digit code by the front sight base is used, this one marked 56. Not sure of the meaning, maybe a lot code?



Early 727 barrels, as in 1988 had a star stamped near the chamber, meaning unkown:



As early as 1989 an O is stamped by the chamber (some look like C’s) were the star was previously, indicating a chromed chamber/bore:



Starting in 95 a date code is stamped by the front sight base all though barrels can be found with dates as early as 02/95 production continued well into 1995 with some barrels being dated and other not. First two digits is the month, second two digit number is the year, this one 03/02:



This one 11/00:



Beginning in the late 90’s a paint mark is added in front and under the barrel nut, not sure of it’s meaning (note that the barrel nut is improperly installed, seen quite a few like this since 1998, they don't work very well):



Original front sight base forging was machined to remove forging flash:



From 1971 on front sight forging was no longer machined to remove flash:



Original front sight base had no forge code:



The .625" "C and Bell" front sight base was used on Colt Carbines from 1971 until the late 1980's (653 pictured):



Late 1980’s “C and Bell” FSB on a 727:



"Crown" front sight base was used on some 700 series Colt Carbines in the Mid 1980's, this one on a early 723 barrel (photo by YardDogOne):



“BFI” in diamond FSB are commonly found on mid to late 1980’s Carbines:



Front sight bases coded with a letter the a R1 in circle and number were common in the late 1980’s onto the mid 1990’s:



Typical gibberish front sight forge code, such codes have been used since the late 1980's:



The M4/A1 front sight base is similar to earlier front sight bases, except that the platform the sight post screws into is higher, these are marked with an F on the left side, and use a standard A2 front sight post. The "F" front sight base went into production in 1995. At least one large 1995 batch of flat top M4A1 Carbines were issued that did not have F front sight bases and used standard A2 front sight post.



607 front cap was the same as used on rifles:



Standard handguard cap:



Handguard cap with M203 clearance cuts. Pictured is a early variation on a 727:



Regular production handguard cap with M203 clearance cuts. These were used on later 723 Carbines, and on the 727 and M4 series.



Original front pivot pin lug was black counter bored:



Starting in 1970 front pivot pin lugs were gray and not counter bored:



GAU-5/A/GAU-5/A/A non-forward assist upper did not have a forge code:



Forward assist upper used on the 607/XM177E1/E2 did not have a forge code:



Forward assist upper used on the 653 typically had a CH forge code:



The 723 and 733 upper incorporated a cartridge deflector:



727 upper was the same as used on the M16A2 with the addition of extended feeding ramps:



M4/A1 Carbine and the 933 ( 920/921/921HB/933) utilize a flat top upper:



Soon after working on carbine versions of the M16A2 Colt found that M855 fed low due to various reasons. To maintain reliable feeding the feeding ramps in the barrel extension were lowered into the upper receiver.

Left, M4 feed ramp used on the M4/M4A1.

Middle, extended 700 series Carbine feed ramps. These are shallower then the feed ramps used on the M4/M4A1, date app 1988-1992, are commonly found on 727 and 733 Carbines/Commandos, some later ones are even stamped "4".

Right, standard rifle feed ramps. These feed ramps were used on 600 series Carbines, and can be found on 700 series Carbines as late as 1990:



Extended 700 series Carbine feed ramps cut into upper:



M4/A1 feed ramps cut into receiver:



Extended 700 series Carbine feed ramps, note the chrome on the inside of this 1988 727 barrel extension:



M4/A1 feed ramps, note extension marked “4”




GAU-5/A/GAU-5/A/A /607/XM177E1/E2 front swivel was attached via a roll pin:



1970 and on Colt Carbines had riveted front swivels (save the M4/A1):



Early M4/A1 swivel was a pinned on type developed for use with the M16 series and the M203. It was reversible so it could be used on both .625" and .750" barrels:



Late M4/A1 swivel, same as before but now .750" only, used in 2000 and on production:



GAU-5/A /607/653/XM177E1 used a standard slip ring:



The GAU-5/A/A/XM177E2 , Colt 700 series, and later used a tapered delta ring:



Top barrel is standard profile as used on the M4 and early M4A1. Lower barrel is the 4 oz heavier barrel used on M4A1's, or Colt Model 921HB as early as January of 2001:



The forward M203 cut out on 700 series Carbine and the M4/A1 are a bit different. The angle slopping into the cut out is sharper 700 series Carbines. Model 727 on top, and M4/A1 on bottom:



607 handguards, note the rear handguard cap (photo by Ordnance):



Handguards, 600 and 700 series on left (excluding the 607), early M4/A1 in the middle, and late M4/A1 on the right. Early M4/A1 handguards are double heat shield, and late (1999 on) M4/A1 handguards have glued in double heatshields and are more matte.





Front sight post used on the 600 series Carbines was the same as that used on the M16A1 except it is about .040" taller:



Front sight post used on 700 series Carbines are the same as that used on the M16A2, save it is about .040" taller:



Front sight post used on the M4/A1 is that same as that used on the M16A2:



600 and 700 series Colt Carbine buffer on the left. On the right the "H" buffer used on the M4/A1 (note the flats on the sides of the "H" buffer). There are more variations of the buffers, will add them once I get ahold of some examples:



The "H" buffer's pad is pinned on. Early 600 series also had a pinned on pad (not pictured):



600 and 700 series Colt Carbine 2 position receiver extension on bottom, M4/A1 four position receiver extension at top:



600 and 700 series Colt Carbine castle nut on left, M4/A1 castle nut on right:



607 buttstock (photos by unkown)





607 buttstock details (photos by Ordnance):







Top GAU-5/A/XM177E1 buttstock, it is the same as the bottom standard 600 series aluminum Colt buttstock, but lacked the coating (photo by Ordnance):



Top, standard 600 series aluminum Colt Carbine buttstock, used from about 1967 until the mid 1980's.

Middle, buttstock used from the mid 1980's up through 2002.

Bottom, modern Colt buttstock used since 2002:



Typical Colt aluminum raised markings (photo by Ordnance):



Buttstock pictured in the middle are typically marked with a raised "N":


machinehead
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Posted: 9/21/2006 7:59:48 AM
Another great post! Tack it
Life's a garden, dig it!
QUIB
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Posted: 9/21/2006 8:51:05 AM

Originally Posted By machinehead:
Another great post! Tack it



If Ekie gives me the ok, I'll tack this.

Excellent post as always! Thank you Ekie!
OH-58 AERO SCOUTS........"Un-armed and un-afraid!"

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Ekie
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Posted: 9/21/2006 9:25:19 AM
Sure, a tack would be fine. Did not get to finish it up last night, decided to post what I had done. So expect a major edit on the text.............
SPTiger
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Posted: 9/21/2006 12:59:21 PM
I've never built an AR before, so I am confused about one thing. How can you tell the barrel nut is installed improperly on the camo'd carbine in the pics above?
Better to have and not need than need and not have

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acr1
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Posted: 9/21/2006 1:37:58 PM
Ekie, Again, I am impressed with what you do here. Great info that really helps set this forum apart.
Ekie
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Posted: 9/21/2006 2:19:09 PM

Originally Posted By SPTiger:
I've never built an AR before, so I am confused about one thing. How can you tell the barrel nut is installed improperly on the camo'd carbine in the pics above?


The nut is on past TDC. One tooth is in contact with the gas tube, and there is a gap on the other side. The tube on this carbine would bind with the gas key on the carrier. The bind was sever enough to cause malfunctions.

Have observed an alarming percentage of Colt's with improperly installed barrel nuts going back to 1998.
Blanco_Diablo
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Posted: 9/21/2006 3:11:21 PM
How do you get all these cool uppers to play around with? I mean, if its not an original 601 upper, its an XM177E2!!

I hate you so much!
SPTiger
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Posted: 9/21/2006 3:59:43 PM

Originally Posted By Ekie:

Originally Posted By SPTiger:
I've never built an AR before, so I am confused about one thing. How can you tell the barrel nut is installed improperly on the camo'd carbine in the pics above?


The nut is on past TDC. One tooth is in contact with the gas tube, and there is a gap on the other side. The tube on this carbine would bind with the gas key on the carrier. The bind was sever enough to cause malfunctions.

Have observed an alarming percentage of Colt's with improperly installed barrel nuts going back to 1998.


Ahh...I see. Thanks for the info. Great pics BTW.
Better to have and not need than need and not have

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Ekie
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Posted: 9/21/2006 4:10:05 PM
[Last Edit: 9/21/2006 4:11:33 PM by Ekie]

Originally Posted By Blanco_Diablo:
How do you get all these cool uppers to play around with? I mean, if its not an original 601 upper, its an XM177E2!!

I hate you so much!


Got the XM177E2 upper as a mutt. Got it on trade for a spare 653 upper and some cash. It had a home done riveted front swivel, a late CH upper, etc, but did have an original grenade ring. I restored it with 1968 era parts, save the upper receiver which is a CK forge code upper circa 1971. Am hoping to find a correct upper for it one of these days.

The 653, 723, and 733 uppers are factory originals I found on WTS ads on Buddy's and the EE.

I have the receipt for the 727 upper, it was purchased factory direct by some Navy War something or the other as a upper and barrel in 1989 or so, and completed with some parts they must have had on hand. It was purchased from that guy with the ACR parts on Buddy's board. I restored it with take off parts from a 733 from the same era.

Colt M4 uppers are common, no explanation needed there.

The 933 upper is a 1995 or so 6721 upper with a 733 barrel swap. Also replaced the bolt carrier. The feed ramps don't mate up quite right in that the 6721 had modern M4 ramps, but it is close.
Elvis-Ar15
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Posted: 9/21/2006 5:25:53 PM
Very nice work Ekie.

Elvis
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buzgun
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Posted: 9/21/2006 5:26:59 PM
Awesome work Ekie !
redfisher
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Posted: 9/26/2006 6:25:28 AM
These threads are the best. Great stuff Ekie.

Wouldn't you love spending a few hours with one of the old salts down at the Hartford plant? Surely they have a showroom, or quasi-museum.............right?
myitinaw
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Posted: 9/26/2006 7:55:38 AM
Ekie for President!

Thatguy96
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Posted: 9/26/2006 7:12:35 PM
The 733 is still being produced, in its current iteration with the 4th gen "enhanced" stock and A2 rear sights. From what I've seen it, like other early 700 series had a number of transitional variations. We've talked about this, so are these just what you're considering the "standard" configurations?
FITTER
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Posted: 9/26/2006 9:17:59 PM
[Arnold]Excellent![/Arnold]
"You anti-union trolls are getting weak. I suggest you organize." CavVet, 8-27-06

Check out Ginger's blog:
http://livingwithmelanoma.blogspot.com/
Ekie
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Posted: 9/27/2006 2:00:06 AM

Originally Posted By Thatguy96:
We've talked about this, so are these just what you're considering the "standard" configurations?


"Standard", maybe, but do consider them to be the following:


Originally Posted By Ekie:
I choose these models in that they are the most common Carbines delivered to the US Military from the late 1960's and on (with the possible exception of the MK18), while excluding Air Force only models.



Originally Posted By Thatguy96:
The 733 is still being produced, in its current iteration with the 4th gen "enhanced" stock and A2 rear sights.


Even though the 733 is a cataloged item, am unaware of any recent US Military use.
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Posted: 9/27/2006 10:16:32 PM
Ah, alright, missed that, sorry.
Lon_Moer
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Posted: 10/4/2006 11:20:03 PM
How about slings? (please )
Blanco_Diablo
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Posted: 10/7/2006 9:45:05 AM
Does anyone know if mottled furnature (pistolgrip/handguards) was ever found on XM177E2s?
Ekie
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Posted: 10/16/2006 1:55:18 PM

Originally Posted By Lon_Moer:
How about slings? (please )


Am missing the first Colt sling, so am waiting to find one of those.


Originally Posted By Blanco_Diablo:
Does anyone know if mottled furnature (pistolgrip/handguards) was ever found on XM177E2s?


Have not really got started on grips, so not sure, but I would not be afraid to use one on a clone.
Gamma762
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Posted: 10/16/2006 2:15:12 PM
Question - I thought 723's had lightweight profile barrels??

ar15.com/forums/topic.html?b=3&f=4&t=279416
Which is why I duct-tape my AR to my body every night before I go to sleep. - DK-Prof
Ekie
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Posted: 10/16/2006 2:41:55 PM
[Last Edit: 10/16/2006 2:44:18 PM by Ekie]

Originally Posted By Gamma762:
Question - I thought 723's had lightweight profile barrels??

ar15.com/forums/topic.html?b=3&f=4&t=279416


Some do, there is a picture of the barrel marking of a pencil barreled 723 in the guide. Sorry that was not clear.
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Posted: 10/18/2006 2:58:33 PM
[Last Edit: 10/18/2006 2:58:56 PM by Blanco_Diablo]
Did 733's use lightweight barrels? 11.5" right?


BTW, check your email, Ekie.
Biggus
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Posted: 10/18/2006 9:35:48 PM
Where do the 977 and 777 carbines fit in? Are they just variations of the 921?
Thatguy96
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Posted: 10/19/2006 1:19:19 AM

Originally Posted By Blanco_Diablo:
Did 733's use lightweight barrels? 11.5" right?


BTW, check your email, Ekie.

I've seen pictures of 11.5" carbines that I believe are 733s with the pencil barrels. What I've always wanted to know is if the current production uses gov't profile ones.
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