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Posted: 8/30/2004 11:01:48 PM EDT
[#1]
read carefully and see if the bolt has letters "MPC". "MPC" is the correct marking for Colt bolts.
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Posted: 8/30/2004 11:22:01 PM EDT
[#2]
Darkest2000 is right, most Colt bolts we have seen are marked MPC, but some are marked MP.
The letter sizes will vary. The C on your carrier is also a colt marking. I have a carrier with a very similar profile in one of my preban colt carbines. |
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Posted: 8/30/2004 11:32:59 PM EDT
[#3]
 DOH! I ment MPC...not CMP (first post corrected)...I also have THREE Colt Bolt/Carriers...forgot to include my 6724....hehehe... The bolt DEFINITELY only says "MP"...there no "C" anywhere.... As for the carrier, I figured it was a Colt bolt because of the "C" marking on the side (and it looks the same as my other Colt bolts) Hey Paul, so does anyone else use just the "MP" marking or only Colt? The quality of the bolt does seem to be on par with my other Colt bolts... I've gone through so many uppers before the 2000 CA Ban that I forgot where I got what parts from but I remember I used only buy Colt stuff (this is before all the other brands started coming out)...I think I never checked this particular bolt/carrier because I probably pulled it out of a complete Colt gun so I assumed it to be a Colt part. 
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Posted: 8/30/2004 11:42:43 PM EDT
[#4]
IIRC, just colt.
Colt marked them MPC and MP (magnetic particle inspected) FN marked MPF (there might be some exceptions) |
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Posted: 8/30/2004 11:55:07 PM EDT
[#5]
Back when Colt was the only maker of parts the need for a maker's mark was moot. The most recent Colt bolts have a date code, consisting of an extra letter, between the MP and C.
Yet again, M is for Magnetic Particle, P is for Proof Load. The FN bolts I have seen (A2 parts) are marked MP N for National Aerospace. |
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Posted: 8/31/2004 2:41:24 AM EDT
[#6]
Thanks for all the info guys...I now feel confident that this bolt is indeed a Colt bolt. Now I got a build upper around it...it's a sickness I tell ya!
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Posted: 9/1/2004 10:12:00 AM EDT
[#7]
I have a bolt, sold to me as a Colt (and looks like it), marked MPF, as described by BravoCompanyUSA above. I had assumed it was of FN manufacture - any idea, Tweak? The extractor is also marked with an F.  |
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Posted: 9/1/2004 10:46:19 AM EDT
[#8]
MPF is FN. Those were USGI Bolts. When inspecting them I thought they all were stamped MPC (ie Colt). We would be happy to swap your MPF for a MPC, and cover your shipping costs - if you would like. sorry. |
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Posted: 9/1/2004 12:30:31 PM EDT
[#9]
BravoCompanyUSA - my apologies for not being clear in my post. I did not purchase the bolt from you, though I certainly appreciate your business practices. I am quite happy with the F marked bolt, just a bit curious about its origin.
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Posted: 9/1/2004 2:26:35 PM EDT
[#10]
No problem. As to its origin If the BRBII is correct, it lists the following: MP - Colt MPC - Colt MPD - Diemaco MPF - FNMI MPF - FNMI -subcontracted MPF - FNMI -subcontracted MPN - National Aerospace MPR - Rock Island Arsenal hope this helps ! |
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Posted: 9/1/2004 6:33:43 PM EDT
[#11]
I have a Colt bolt that just has a "C" electro-penciled on it, go figure.
Yeah, I know what your thinking, well you would be mistaken. It came out of a new MT6400C rifle that was bought directly from a wholesale distributor so I am 100% sure it came out of the Colt factory that way. |
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Posted: 9/1/2004 7:09:45 PM EDT
[#12]
Anyone know of this one? It's a modified FA carrier only marking is the Y in a Circle.
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Posted: 9/2/2004 12:27:54 AM EDT
[#13]
Sparsky,
If it was a Russian part I'd say it had been proof load tested.  Just posted this, been behind in my posting of outside research. T'shooting Forum ETA, Thanks all, I just linked this to the FAQ. |
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Posted: 9/2/2004 5:57:55 AM EDT
[#14]
Mine is marked MPF. Perhaps FNMI subcontracted Colt - ? |
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Posted: 9/2/2004 7:12:41 AM EDT
[#15]
Sparksy,
That's a hippie peace sign. 
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Posted: 9/2/2004 12:55:07 PM EDT
[#16]
Hey Tweak, that's great info straight from the horse's mouth (FN)...definitely will refer people to that thread when the FN part discussions pop up!
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Posted: 9/2/2004 1:12:56 PM EDT
[#17]
Mercedes! Wow, those are rare. |
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Posted: 9/2/2004 1:44:29 PM EDT
[#18]
LOL.... Seems I must've got something rare, no one knows where it came from. |
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Posted: 9/2/2004 3:01:23 PM EDT
[#19]
Not Sure ? - don't have specific broken down info on the subs Possibly could have been made by a variety of quality machine shops. |
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