HISTORY / BACKGROUND:-
The Colt Model 603 / M16A1 was the final model that incorporated all of the improvements requested by the
US Military. Those Improvements included, a modified buttstock with internal storage space, etc.
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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:
Improved / current rifle buffer
SPRING:
TUBE:
Current tube with wrench flats on end
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LOWER RECEIVER:
STYLE:
Full Fence
MARKINGS:
Colt Logo
PROPERTY
OF U.S. GOVT.
XM 16 E1
CAL. 5.56 M.M.
Serial XXXXXXX
SELECTOR:
"Later"
TAKEDOWN / PIVOT PINS:
"Later" Pins
BOLT CATCH/RELEASE:
"Latter" with Raised/Grooved End
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UPPER RECEIVER:
PROOF MARKS / FORGE CODE:
Colt Proof Marks - Triangle & Square with "C"
Located in front of ejection port
No Forge Code
REAR SIGHT:
Raised Directional Markings on Receiver
EJECTION PORT COVER:
"Later" with " Rectangular Plate"
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BOLT GROUP:
CARRIER:
Manganese Phosphate Finish with Forward Assist Serrations
BOLT:
Manganese Phosphate Finish
FIRING PIN:
Improved Light Flat Head
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CHARGING HANDLE:
Improved / Current Design
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HANDGUARD SLIP RING:
Flat
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BARREL:
DIAMETER:
0.625" at the Front Sight Base
LENGTH:
20"
TWIST RATE:
1/12
MARKINGS:
See the Rifle Guide for Details
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HANDGUARDS:
Standard Black Triangular
Early - with drain holes
Late - with drain holes and "left" & "right" markings
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FRONT SIGHT BASE:
STYLE:
Early - Forged, with flash removed
Late - Forged
MARKINGS:
Early - No Markings
Late - "Bell" & "C"
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FLASHHIDER:
A1 Birdcage
RETRO BLACK RIFLE - RIFLE GUIDE - MODEL 603 / M16A1
Unknown Date - Vietnam US Army
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Unknown Date - Vietnam US Army
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ADDITIONAL COLT MODEL 603 / M16A1 INFORMATION
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.223 Cal / 5.56mm MILITARY RIFLE GUIDE
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