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AGG
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Posted: 5/12/2011 4:12:13 PM
I posted my query over on the AR Discussion board and was suggested to ask here.

My question deals with certain GLC's, particularly with the "raised fence" on the right receiver.
My understanding is a follows:

1. @ 550 of R6450 (TA/9mm) and @ 1,000 of R6520 (GC/.223)
2. Released @ 1990/1991 and not intended for the civilian market
3. A1 and A2 sights, respectively
4. Small rear takedown lug/large front pivot pin lug
5. No block
6. 4-position collapsible stock (as opposed to 2-position on "green label/non-raised fence" or 6-position on "blue label/LE-marked"

Can anyone provide any clarity to these beliefs?
Any information would be greatly appreciated.

Tony
George_in_Wis
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Posted: 5/13/2011 11:52:08 AM
[Last Edit: 6/6/2011 12:25:03 PM by George_in_Wis]
Thought you'd get a little more input over here, but the traffic volume is much lower than on the other forum.

Did find a little info in the archive. It only addresses the 6520, though. http://www.ar15.com/archive/topic.html?b=3&f=118&t=270259

I'll post the main entry in case the link doesn't work for you. Thanks go to Ekie.


1988-1989

GC 000550 can't make out the upper forge code, old style receviver extention nut/receiver extention/buttstock, slab side lower, small trigger pins, SP1 bolt carrier, blue extractor buffer, roll marked COLT'S FIREARMS DIVISION, no sear block

GC 000XXX can't make out the upper forge code, old style receviver extention nut/receiver extention/buttstock, slab side lower, small trigger pins, SP1 bolt carrier, blue extractor buffer, roll marked COLT'S FIREARMS DIVISION, no sear block, this one has a replacement grip

GC 000723 can't make out the upper forge code, old style receviver extention nut/receiver extention/buttstock, slab side lower, small trigger pins, SP1 bolt carrier, blue extractor buffer, roll marked COLT'S FIREARMS DIVISION, no sear block

GC 0054XX CM upper forge code, old style receiver extension nut/buttstock/nut, mag fenced lower, big pivot pin, small trigger pins, M16 bolt carrier, blue extractor buffer, roll marked COLT'S FIREARMS DIVISION, no sear block, barrel marked C MP 5.56 NATO 1/7 with a "2" at the front and the "0" for chromed lined at the nut, M4 feed ramps with the barrel extension marked but not the receiver

GC 0055XX CMB upper forge code, old style receviver extention nut/receiver extention/buttstock, mag fenced lower, big pivot pin, small trigger pins, SP1 bolt carrier, blue extractor buffer, roll marked COLT'S FIREARMS DIVISION, no sear block

1990

GS 005600 or GS 005500 missmarked Carbine, only picture of roll marks, can see that it is a slab side lower

GC 006XXX can't make out the upper forge code, old style receviver extention nut/receiver extention/buttstock, slab side lower, trigger pin size (?), SP1 bolt carrier(?), blue extractor buffer, roll marked COLT'S MFG CO. INC., no sear block, green label box

GC 0065XX M4 marked barrel extention, M4 ramps in upper

GC 0066XX CM upper forge code, old style receviver extention nut/receiver extention/buttstock, slab side lower, small trigger pins, SP1 bolt carrier(?), blue extractor buffer, roll marked COLT'S MFG CO. INC., no sear block, green label box

GC 0067XX CM upper forge code, old style receviver extention nut/receiver extention/buttstock, slab side lower, small trigger pins, SP1 bolt carrier(?), blue extractor buffer, roll marked COLT'S MFG CO. INC., no sear block, green label box, manual dated 1990

GC 0068XX CM upper forge code, old style receviver extention nut/receiver extention/buttstock, buttstock not marked, slab side lower, small trigger pins, SP1 bolt carrier, blue extractor buffer, roll marked COLT'S MFG CO. INC., no sear block, green label box, no M4 feed ramps, barrel marked C MP 5.56 NATO 1/7, peel washer

GC 007786 CM upper forge code, old style receviver extention nut/receiver extention/buttstock, , slab side lower, small trigger pins, SP1 bolt carrier ?, blue extractor buffer?, roll marked COLT'S FIREARMS DIVISION no sear block, peel washer

1991-1992

GC 00XXXX CM upper forge code, old style receviver extention nut/receiver extention/buttstock, mag fenced lower, big pivot pin, trigger pin size (?), SPORTER bolt carrier, blue extractor buffer, roll marked COLT'S MFG CO. INC., no pinned in sear block

GC 0087XX CM upper forge code, old style receviver extention nut/receiver extention/buttstock, mag fenced lower, big pivot pin, trigger pin size (?), SPORTER bolt carrier, blue extractor buffer, roll marked COLT'S MFG CO. INC., sear block pinned in on right side

1993- Sept 1994

GC 010272 this is a lower only, old style receviver extention nut/receiver extention/buttstock, mag fenced lower, small pivot pin hole, weep hole drilled, trigger pin size (?), marked COLT'S MFG CO. INC., sear block pinned in on right side

GC 01XXXX CMB upper forge code, mag fenced lower, small pivot pin hole, weep hole drilled?, large trigger pins, roll marked COLT'S MFG CO. INC., extention and upper marked 4, has M4 feed ramps

GC 015305 CMB upper forge code, old style receviver extention nut/receiver extention/buttstock, mag fenced lower, small pivot pin hole, weep hole drilled, large trigger pins, SPORTER bolt carrier, blue extractor buffer, roll marked COLT'S MFG CO. INC., sear block pinned in on right side, barrel marked C MP 5.56 NATO 1/7

GC 015XXX CMB upper forge code, roll marked COLT'S MFG CO. INC., has real M4 ramps, not the dremel jobs, "4" stamped about an inch or so above the gas tube, the barrel extension has the "4" on it as well, O stamped above chamber, no number stamped in barrel behind handguard cap

GC 0164XX CMB upper forge code, old style receviver extention nut/receiver extention/buttstock, mag fenced lower, small pivot pin hole, weep hole drilled, large trigger pins, SPORTER bolt carrier, blue extractor buffer, roll marked COLT'S MFG CO. INC., sear block pinned in on right side, blue label box

GC 165XX looks like sear block is pinned on right side only

GC 016614 CMB upper forge code, old style receviver extention nut/receiver extention/buttstock, mag fenced lower, small pivot pin hole, weep hole drilled (?), large trigger pins, SPORTER bolt carrier, blue extractor buffer, roll marked COLT'S MFG CO. INC., sear block pinned in on right side, this one has a replacement flash suppressor and grip

GC 0172XX CMB upper forge code, old style receviver extention nut/receiver extention/buttstock, mag fenced lower, small pivot pin hole, weep hole drilled, large trigger pins, SPORTER bolt carrier, blue extractor buffer, roll marked COLT'S MFG CO. INC., sear block pinned in right side, M4 feed ramps, barrel marked C MP 5.56 NATO 1/7

GC 017740 CMB upper forge code, old style receviver extention nut/receiver extention/buttstock, mag fenced lower, small pivot pin hole, no weep hole, large trigger pins, SPORTER bolt carrier, blue extractor buffer, roll marked COLT'S MFG CO. INC., sear block pinned in on both sides

GC 017774 CMB upper forge code, old style receviver extention nut/receiver extention/buttstock, mag fenced lower, small pivot pin hole, no weep hole, large trigger pins, SPORTER bolt carrier, blue extractor buffer, roll marked COLT'S MFG CO. INC., sear block pinned in on both sides

GC 018500 CMB upper forge code, old style receviver extention nut/receiver extention/buttstock, mag fenced lower, small pivot pin hole, no weep hole, large trigger pins, SPORTER bolt carrier, blue extractor buffer, roll marked COLT'S MFG CO. INC., sear block pinned in on both sides

Sept 1994-May 1995

GC 0193XX small pivot pin hole, no weep hole, large trigger pins (lower only)

GC 02091X upper forge code? old style receiver extension nut/buttstock?, new four position receiver extension, mag fenced lower, small pivot pin hole, weep hole drilled?, large trigger pins, SPORTER bolt carrier, blue extractor buffer, roll marked COLT'S MFG CO. INC., sear block pinned on both sideS?, M4 feed ramps, barrel marked C MP 5.56 NATO 1/7 and 02/95

GC 021031 an M4gery conversion, look like it has a sear block pinned in on both sides

June 1995-1997

LGC 003075 CMB upper forge code, old style buttstock, M4 receviver extention/nut/buffer, mag fenced lower, small pivot pin hole, no weep hole, large trigger pins, SPORTER bolt carrier, blue extractor buffer, roll marked COLT'S MFG CO. INC., no pinned sear block, blue label box, LEO roll markings, blue label, bolt has white paint mark, and carrier has shrouded firing pin, don't know if this bolt group is original (this particular Carbine has had the buttstock replaced with a modern M4)

1998-2001

LGC 017XXX black finish, forge code?, old style buttstock, M4 receviver extention/nut/buffer, mag fenced lower, small pivot pin hole, weep hole drilled, large trigger pins, SPORTER bolt carrier, extractor buffer color?, roll marked COLT'S MFG CO. INC, no pinned sear block, blue label box, LEO roll markings,

2002-2004

LGC 0XXXXX black finish, key hole forge code?, M4 receviver extention/nut/buffer & buttstock, mag fenced lower, factory front push pin, large trigger pins, bolt carrier?, black extractor buffer with gold spring?, roll marked COLT DEFENSE, no pinned sear block, blue label box, crush washer for flash, LEO roll markings, large reinforced lower receiver ring for the extention, barrel marked C MP 5.56 NATO 1/7

2005-2006

LGC 030000 Diemaco marked carrier, made in June of 2005

LGC 033686 black finish, forge code?, M4 receviver extention/nut/buttstock/buffer, mag fenced lower, factory front push pin, large trigger pins, bolt carrier?, black extractor buffer with gold spring?, roll marked?, no pinned sear block, crush washer for flash, LEO roll markings

LGC 0342XX black finish, forge code forge marking is a capital "C" with an odd lopsided gemoetric figure, not the Cerro mark, that's for sure, M4 receviver extention/nut/buttstock/buffer, mag fenced lower, factory front push pin, large trigger pins, M16 bolt carrier, black extractor buffer with gold spring?, roll marked COLT DEFENSE, no pinned sear block, crush washer for flash, LEO roll markings, barrel marked C MP 5.56 NATO 1/7, M4 feed ramps

LGC 034XXX black finish, forge code?, M4 receviver extention/nut/buttstock/buffer, mag fenced lower, factory front push pin, large trigger pins, M16 bolt carrier, black extractor buffer with gold spring?, roll marked?, no pinned sear block, crush washer for flash, LEO roll markings, barrel dated 04/05

LGC 03496X COLT DEFENSE, LEO roll markings. M4 feed ramps

LGC 03498X keyhole forge code, COLT DEFENSE, LEO roll markings M4 feed ramps

LGC 03500X black finish, Cerro Forge Key Hole marked upper, M4 receviver extention/nut/buttstock/buffer, mag fenced lower, factory front push pin, large trigger pins, M16 bolt carrier, bolt marked MPC, black extractor buffer with gold spring?, roll marked COLT DEFENSE, no pinned sear block, crush washer for flash, LEO roll markings, large reinforced lower receiver ring for the extention, M4 feed ramps, receiver ramp bare, black ejection port spring, barrel dated 06/05, hammer marked C

LGC 035006 black finish, forge code?, M4 receviver extention/nut/buttstock/buffer, mag fenced lower, factory front push pin, large trigger pins, bolt carrier?, black extractor buffer with gold spring?, roll marked COLT DEFENSE, no pinned sear block, crush washer for flash, LEO roll markings, large reinforced lower receiver ring for the extention

LGC 036700 black finish, forge code?, M4 receviver extention/nut/buttstock/buffer, mag fenced lower, factory front push pin, large trigger pins, bolt carrier?, black extractor buffer with gold spring?, roll marked COLT DEFENSE, no pinned sear block, crush washer for flash, LEO roll markings, large reinforced lower receiver ring for the extention

LGC 036941 black finish, forge code?, M4 receviver extention/nut/buttstock/buffer, mag fenced lower, factory front push pin, large trigger pins, bolt carrier?, black extractor buffer with gold spring?, roll marked?, no pinned sear block, crush washer for flash, white sticker box, LEO roll markings, large reinforced lower receiver ring for the extention

LGC 036966 black finish, key hole forge code?, M4 receviver extention/nut/buttstock/buffer, mag fenced lower, factory front push pin, large trigger pins, bolt carrier?, black extractor buffer with gold spring?, roll marked?, no pinned sear block, crush washer for flash, LEO roll markings, large reinforced lower receiver ring for the extention

LGC 03XXX black finish, key hole forge code, M4 receviver extention/nut/buttstock/buffer, mag fenced lower, factory front push pin, large trigger pins, bolt carrier marked C, black extractor buffer with gold spring?, roll marked COLT DEFENSE, no pinned sear block, crush washer for flash, LEO roll markings, large reinforced lower receiver ring for the extention, barrel marked C MP 5.56 NATO 1/7, M4 feed ramps but receiver ramps are in the white, no 4 marking on upper or extention, Diemaco bolt marked MPD 3021.


AGG
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Posted: 5/14/2011 8:53:12 PM
George,

Thank you very much––- that is very helpful!!!

Tony
AGG
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Posted: 6/6/2011 11:54:24 AM
Update––- See under "AR-15"/"AR Discussions".

Tony
AGG
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Posted: 6/14/2011 4:42:10 PM
Anyone care to add to the numbers under "AR Discussion"???

Tony
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