Colt Carbine

[schwantz]

Search came up empty so I figured I would post this question here. I have a rifle with the box end label (blue) marked "R6521". The lower receiver is marked "Colt Carbine" with serial # CC0010xx. I would appreciate any information regarding this variation.

[RojasTKD]

Found this on Wikipedia:
http://en.wikipedia.org/wiki/AR-15_variants
Seems it is an similar or the same as the R6520 but is a "AR-15A2 Government Carbine (Special export model with receiver block and large pin upper receiver"

Read someware else there where between 300 and 400 overuns that where sold in the us.

[edit] Numbered Colt civilian models
Colt’s civilian line is identified by a four digit code following a specific prefix. Initially all Colt civilian weapons were listed with an “R” prefix, with this changing to “AR” following the passage of the Federal Assault Weapons Ban in 1994. Colt also produced a line of weapons aimed at target shooters under the “MT” prefix, which stood for Match Target, as well as, the Colt Accurized Rifle, which was the only model to feature the CR prefix. Most recently with the shift in marketing policy by Colt Defense, these weapons have been given the “LE” prefix. Currently, Colt Defense has no line targeted specifically at the private civilian market.


[edit] R series models
Colt model no. Name Stock Fire control Rear sight Forward assist Case deflector Barrel length Barrel profile Barrel twist Hand guards Bayonet Lug Muzzle device
R6000 AR-15 Sporter (SP1) A1 S-1 A1 No No 20 in. A1 1:12 Triangular Yes Type 2 Duckbill or A1
R6001 AR-15 Sporter Carbine (SP1 Carbine) 3rd Generation S-1 A1 No No 16 in. A1 1:12 Short Ribbed Yes A1
R6002 AR-15 Sporter (SP1; Bundled with 3x scope) A1 S-1 A1 No No 20 in. A1 1:12 Triangular Yes A1
R6003 AR-15 Sporter Carbine (SP1 Carbine; Bundled with 3x scope) 3rd Generation S-1 A1 No No 16 in. A1 1:12 Short Ribbed Yes A1
R6004 AR-15 Sporter (SP1; Bundled with Colt Reflex Sighting System) A1 S-1 A1 No No 20 in. A1 1:12 Triangular Yes A1
R6420 AR-15A2 Sporter II Carbine 3rd Generation S-1 A2 Yes No 16 in. A1 1:7 Short Ribbed Yes A2
R6430 Sporter Lightweight (9mm) 3rd Generation S-1 A2 No Yes 16 in. A1 1:10 Short Ribbed Yes A2
R6450 AR-15 9mm Carbine 3rd Generation S-1 A2 No No 16 in. A1 1:10 Short Ribbed Yes A2
R6500 AR-15A2 Sporter II A2 S-1 A2 Yes No 20 in. A1 1:7 Short Ribbed Yes A2
R6510 AR-15A2 Sporter II (Special export model in .222 Remington) A2 S-1 A2 Yes No 20 in. A1 1:7 Short Ribbed Yes A2
R6520 AR-15A2 Government Carbine 3rd Generation S-1 A2 Yes Yes 16 in. A1 1:7 Short Ribbed Yes A2
R6521 AR-15A2 Government Carbine (Special export model with receiver block and large pin upper receiver) 3rd Generation S-1 A2 Yes Yes 16 in. A1 1:7 Short Ribbed Yes A2
R6530 Sporter Lightweight 3rd Generation S-1 A2 Yes Yes 16 in. A1 1:7 Short Ribbed No A2
R6550 AR-15A2 Government A2 S-1 A2 Yes No 20 in. A2 1:7 Ribbed Yes A2
R6550CC AR-15A2 Government (w/ factory camouflage finish) A2 S-1 A2 Yes No 20 in. A2 1:7 Ribbed Yes A2
R6550K AR-15A2 Government (w/ factory installed .22 Long Rifle conversion kit) A2 S-1 A2 Yes No 20 in. A2 1:7 Ribbed Yes A2
R6551 Sporter Target A2 S-1 A2 Yes No 20 in. A2 1:7 Ribbed Yes A2
R6600 AR-15A2 HBAR A2 S-1 A2 Yes No 20 in. HBAR 1:7 Ribbed Yes A2
R6600DH AR-15A2 Delta HBAR (bundled w/ Tasco 3-9x scope and cheekpiece) A2 S-1 A2 Yes No 20 in. HBAR 1:7 Ribbed Yes A2
R6600K AR-15A2 HBAR (w/ factory installed .22 Long Rifle conversion kit) A2 S-1 A2 Yes No 20 in. HBAR 1:7 Ribbed Yes A2
R6601 Sporter Match HBAR A2 S-1 A2 Yes No 20 in. HBAR 1:7 Ribbed No A2
R6601DH Sporter Match Delta HBAR (bundled w/ Tasco 3-9x scope and cheekpiece) A2 S-1 A2 Yes No 20 in. HBAR 1:7 Ribbed No A2
R6700 Sporter Competition HBAR A2 S-1 Flattop Yes No 20 in. HBAR 1:9 Ribbed No A2
R6700CH Sporter Competition HBAR (bundled w/ Tasco 3-9x scope and cheekpiece) A2 S-1 Flattop Yes No 20 in. HBAR 1:9 Ribbed No A2
R6700S Sporter Competition HBAR (bundled w/ Tasco 3-9x scope) A2 S-1 Flattop Yes No 20 in. HBAR 1:9 Ribbed No A2
R6701 Sporter Competition HBAR (Special limited edition production run) A2 S-1 Flattop Yes No 20 in. HBAR 1:9 Ribbed No A2
R6721 AR-15A3 Tactical Carbine 4rd Generation S-1 A2 Yes Yes 16 in. HBAR 1:9 Short Ribbed Yes A2
R6724 Sporter Competition HBAR A2 S-1 Flattop Yes No 24 in. HBAR 1:9 Ribbed No A2
R6731 AR-15A3 Competition HBAR A2 S-1 A2 Yes Yes 16 in. HBAR 1:9 Short Ribbed No A2
R6750 Sporter Competition HBAR (bundled w/ bipod) A2 S-1 A2 Yes Yes 20 in. Super-Heavy 1:7 Ribbed No A2
R6821 Sporter Carbine (7.62x39mm) 3rd Generation S-1 A2 Yes Yes 16 in. HBAR 1:12 Short Ribbed No A1
R6831 Sporter Lightweight (7.62x39mm) 3rd Generation S-1 A2 Yes Yes 16 in. A1 1:12 Short Ribbed No A1