Shop Handlesets.com for discount pricing on all door hardware. Large inventory of door knobs, locks, deadbolts, levers, and more with free ground shipping options. Bolt and Bolt Carrier Manufacturer Stampings (Above) Colt carriers have a 'C' stamped to the left of where the firing pin retainer is inserted (Left) Colt bolts are marked 'MPC' on the side between the ejector and extractor pin holes - Image enhanced with red text for illustrative purposes. Bolt Stamping Information Courtesy John M.
C Mp Chrome Bore
BUTTSTOCK:
STYLE:
2nd Generation Collapsing Stock
MATERIAL:
Aluminum Body coated with Vinyl-Acetate
_________________________________________________________________________________________________
BUFFER GROUP:
BUFFER:
Standard Carbine Buffer
SPRING:
Standard Carbine Spring
TUBE:
2-Position Tube
_________________________________________________________________________________________________
LOWER RECEIVER:
STYLE:
Slabside'
MARKINGS:
(Colt Logo) Colt
AR15
Model Sp1
Serial SP XXXXX
TAKEDOWN / PIVOT PINS:
Late Takedown Pin
Large Screw Pivot Pin
SELECTOR:
'Later'
MAGAZINE RELEASE BUTTON:
Later/Improved with Circular Line Pattern
BOLT CATCH/RELEASE:
'Later'
OTHER:
Milled selector stops
_________________________________________________________________________________________________
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
_________________________________________________________________________________________________
BOLT GROUP:
Standard Colt Bolt Group
with a 'C' marked Carrier,
and a 'MPC' marked Bolt
_________________________________________________________________________________________________
HANDGUARD SLIP RING:
Flat
_________________________________________________________________________________________________
BARREL:
DIAMETER:
0.625' at the Front Sight Base
LENGTH:
16'
TWIST RATE:
1/12
MARKINGS:
'Early' - C MP B
M = Magnetic Particle Inspected
P = Proof Fired
B = Chrome Bore
'Late' - C MP Chrome Bore
_________________________________________________________________________________________________
HANDGUARDS:
Carbine Handguard
with Single Heat Shield
_________________________________________________________________________________________________
FLASHHIDER:
A1 'Birdcage'
_________________________________________________________________________________________________
Scope:
Colt 3X
_________________________________________________________________________________________________r
STYLE:
2nd Generation Collapsing Stock
MATERIAL:
Aluminum Body coated with Vinyl-Acetate
_________________________________________________________________________________________________
BUFFER GROUP:
BUFFER:
Standard Carbine Buffer
SPRING:
Standard Carbine Spring
TUBE:
2-Position Tube
_________________________________________________________________________________________________
LOWER RECEIVER:
STYLE:
Slabside'
MARKINGS:
(Colt Logo) Colt
AR15
Model Sp1
Serial SP XXXXX
TAKEDOWN / PIVOT PINS:
Late Takedown Pin
Large Screw Pivot Pin
SELECTOR:
'Later'
MAGAZINE RELEASE BUTTON:
Later/Improved with Circular Line Pattern
BOLT CATCH/RELEASE:
'Later'
OTHER:
Milled selector stops
_________________________________________________________________________________________________
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
_________________________________________________________________________________________________
BOLT GROUP:
Standard Colt Bolt Group
with a 'C' marked Carrier,
and a 'MPC' marked Bolt
_________________________________________________________________________________________________
HANDGUARD SLIP RING:
Flat
_________________________________________________________________________________________________
BARREL:
DIAMETER:
0.625' at the Front Sight Base
LENGTH:
16'
TWIST RATE:
1/12
MARKINGS:
'Early' - C MP B
M = Magnetic Particle Inspected
P = Proof Fired
B = Chrome Bore
'Late' - C MP Chrome Bore
_________________________________________________________________________________________________
HANDGUARDS:
Carbine Handguard
with Single Heat Shield
_________________________________________________________________________________________________
FLASHHIDER:
A1 'Birdcage'
_________________________________________________________________________________________________
Scope:
Colt 3X
_________________________________________________________________________________________________r
C Mp Chrome Bore Installer
C Mp Chrome Bore Barrel For Sale
Good afternoon. I recently purchased a Colt SP1 (R6000), which based off of the serial number dates to 1975. What concerns me is that the barrel markings read 'MP CHROME BORE'. My understanding and research tells me that there should always be a 'C' marking on Colt rifles. It is common knowledge that Colt just used whatever parts they had available (including Govt. contract parts) and I cannot find any conclusive info on the inter-webs, so I am hoping that some of you Colt experts can set me straight on the matter. Somewhere I was reading that there is sometimes a marking on the barrel between the FSP clamps, but I see nothing there either. My fear is that this rifle was re-barreled at some point or the upper is not Colt. Your expertise is appreciated.
Attachment 48573Attachment 48574