Please click here to visit the "Military Carbine Components Guide" for
additional info and photos of the various components used on this model.
HISTORY / BACKGROUND:
This was the first carbine configuration in the Colt 600 Series built with a 14.5" barrel. With the
exception of the "Original Model 605 Carbine", this was the only other carbine built with a Fixed
Buttstock. The only differences between the Model 651 and the 652 was the presence of the Forward
Assist on the Model 651, and the lack of a Forward Assist on the Model 652. There is very little
photographic documentation of these Carbines in use in the field, and likewise there is very little
information on who was the primary end user of this Model.
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BUTTSTOCK:

SCREW:
Short A1 screw, with hole

BUTTPLATE:
Solid one piece plastic

SLING MOUNT:
Fixed metal sling mount, attached
to the stock body with a screw

BODY:
Hollow storage compartment


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BUFFER GROUP:
BUFFER:
Standard Rifle Buffer


SPRING:
Standard Rifle Spring



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LOWER RECEIVER:
STYLE:
Full Fence

MARKINGS:





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UPPER RECEIVER:
PROOF MARKS / FORGE CODE:
Colt Forge Mark Inside Carry Handle
Below Rear Sight.

See the Component Guide for a
listing of Forge Codes.


REAR SIGHT:
Standard "Late Production" A1 Sight


EJECTION PORT COVER:
"Late A1 Production" Type


FORWARD ASSIST:
Initially produced with the "Original"
Tear Drop Assist.

Later fielded with the "Early"
Round Assist.


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BOLT GROUP:
Standard Colt Bolt Group



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HANDGUARD SLIP RING:
Flat




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BARREL:
DIAMETER:
0.625" at the Front Sight Base

LENGTH:
14.5"

TWIST RATE:
1/12

MARKINGS:
"Early" - C MP B
M = Magnetic Particle Inspected
P = Proof Fired
B = Chrome Bore

"Late" - C MP Chrome Bore

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HANDGUARDS:
Carbine Handguard
with Single Heat Shield




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FLASHHIDER:
A1 "Birdcage"
RETRO BLACK RIFLE - CARBINE GUIDE - MODEL 651 & 652
Colt Model 605
.223 Cal / 5.56mm
MILITARY CARBINE
GUIDE
Colt Model 607
Colt Model 608
Colt Model 609
XM177E1
Colt Model 610
XM177
Colt Model 619
& 620
Colt Model 629
XM177E2
Colt Model 630
USAF GAU-5A
Colt Model 639
Colt Model 649
USAF GAU-5A/A
Colt Model 651
& 652
Colt Model 653
& 654
Military Carbine
Components Guide
US Air Force
Carbine Guide
setstats