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Posted: 8/12/2010 4:11:34 PM EDT
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I have a few AR's but have no knowledge in colt or short barred rifles/pinned flash hiders, as all my other rifles are of other brands and 16' + lol
Im just looking for some info on this upper I took in on a trade. here is the info I was given. Unfired colt 14.5 inch with perm flash hider. I was interested in the method used to pin the flash hider as im told there are a few different way, perhaps some of you guys can tell by the photo's. I was also interested in the bolt and carrier. the bolt is marked "MPF" and the only marking on the carrier i see is an " A " .. its a full auto style carrier though, is this colt ? I remember hearing somewhere that MPF was FN, is that common to find on colt uppers ? also just any other general info on the upper, model number "if applicable" ect. upper had a rail installed that i had removed before purchase. purchased from a respected member so I believe the info he gave me, just like to know everything I can about the items I own and hes out of town at the moment so im going to bug you good people 
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The upper receiver is Colt as well as the barrel. The flash hider is a pinned YHM 5C2. The 14.5 inch barrel wit the YHM FH should keep it over 16", but barely, so it is non NFA. Close the bolt, drop a rod down the barrel to the face and mark the distance at the end of the FH. That distance will give you the length. I'm guessing it'll be just over 16".
I don't know what the markings on the bolt carrier are. Someone will though. A close up of the bolt, including the lugs would help for identifying the bolt itself. The bolt may be Colt with another brand carrier. Is it possible the "A" is a stylized "D"? |
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Quoted:
The upper receiver is Colt as well as the barrel. The flash hider is a pinned YHM 5C2. The 14.5 inch barrel wit the YHM FH should keep it over 16", but barely, so it is non NFA. Close the bolt, drop a rod down the barrel to the face and mark the distance at the end of the FH. That distance will give you the length. I'm guessing it'll be just over 16". I don't know what the markings on the bolt carrier are. Someone will though. A close up of the bolt, including the lugs would help for identifying the bolt itself. The bolt may be Colt with another brand carrier. Is it possible the "A" is a stylized "D"? im fairly sure its an "A" located at the front left side of the carrier EDIT~ The only reason i didnt take photo's of the bolt and carrier were i just oiled up the rifle and the glare wasnt allowing me to show any marking.....was to lazy to whipe down and re-oil [new upper.. want to keep her oiled good for the weekend range trip] 
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An "A" marked carrier indicates Advanced Ordnance made the bolt carrier. An MPF marked bolt is indeed a bolt from FN.
ETA: I'll bet that if you look at the front of the upper receiver (above the gas tube hole) you will see a small M4, and the upper will have M4 feed ramps. |
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The Colt carrier should have a "C" stamped on the side. I bought a stock Colt MT6700, with only 15 rounds through it. It had a carrier with no visible markings, the bolt was marked correctly but I couldn't find the C anywhere. I posted this in the Industry forum and was told by some that really know these rifles that there were some carriers with no C stamp, but rare. I wanted to know it was entirely Colt for any possible resale down the road. I bought a complete Colt BCG in the EE, and I am using the one that came with it as a back up. Looks like a nice upper you got there.
Enjoy NCH |
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An "A" marked carrier indicates Advanced Ordnance made the bolt carrier. An MPF marked bolt is indeed a bolt from FN. ETA: I'll bet that if you look at the front of the upper receiver (above the gas tube hole) you will see a small M4, and the upper will have M4 feed ramps. Advanced Ordnance was contracted to make carriers for FN correct ? .. may have that wrong, not up to speed on these makers. i went ahead and took photo's just for added info. 
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Quoted:
An "A" marked carrier indicates Advanced Ordnance made the bolt carrier. An MPF marked bolt is indeed a bolt from FN. ETA: I'll bet that if you look at the front of the upper receiver (above the gas tube hole) you will see a small M4, and the upper will have M4 feed ramps. correct, the upper does have "M4" in small print above the gas tube port and m4 feedramps |
| You've got a nice upper assembly! I don't know about the subcontractors for FN though. I've heard that so and so makes parts for FN. The only way to be sure would be to ask someone that works at FN about the parts that are used to assemble the rifles. I recently got a bolt carrier assembly manufactured by ToolCraft Inc. that was marked with 1B1B6 on the bolt carrier, and it had a bolt marked exactly the same as yours. It was advertised as a subcontractor to FN. ToolCraft won a gov't contract in 2007 to manufacture 700,000 bolt carriers and keys for the Army, and they are located 160 miles from the FN plant in Columbia, SC. |
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You've got a nice upper assembly! I don't know about the subcontractors for FN though. I've heard that so and so makes parts for FN. The only way to be sure would be to ask someone that works at FN about the parts that are used to assemble the rifles. I recently got a bolt carrier assembly manufactured by ToolCraft Inc. that was marked with 1B1B6 on the bolt carrier, and it had a bolt marked exactly the same as yours. It was advertised as a subcontractor to FN. ToolCraft won a gov't contract in 2007 to manufacture 700,000 bolt carriers and keys for the Army, and they are located 160 miles from the FN plant in Columbia, SC. thanks for the info, everything looks good and im not to worried about the BCG and bolt not being colt...although it would have been ideal as far as right now im going to set the rifle up as a basic range/HD rifle so as long as it works and the parts are of good quality its GTG for me
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From the photos it is not a Colt carrier or bolt. You are probably on the right path with FN.
The above poster is right that some Colt carriers are not marked. These would be really early Colts before there was a need to mark them. The bolts in those early carriers still have distinguishing marks that show they are Colt. Typically Colt lugs will have a diagonal line behind each lug. Also, the staking on the carrier keys of the unmarked early Colts is the different from the current type of staking. However, this doesn't apply to yours since the upper and barrel are relatively new. If the carrier was a Colt it would be marked with the "C" for the time that weapon was made. Sometimes you will see a stylized "D" which looks like an "A" for Canadian Colt carriers and that is why I asked. Again this doesn't apply to yours since that is clearly an "A". Either way, nice upper. |
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From the photos it is not a Colt carrier or bolt. You are probably on the right path with FN. The above poster is right that some Colt carriers are not marked. These would be really early Colts before there was a need to mark them. The bolts in those early carriers still have distinguishing marks that show they are Colt. Typically Colt lugs will have a diagonal line behind each lug. Also, the staking on the carrier keys of the unmarked early Colts is the different from the current type of staking. However, this doesn't apply to yours since the upper and barrel are relatively new. If the carrier was a Colt it would be marked with the "C" for the time that weapon was made. Sometimes you will see a stylized "D" which looks like an "A" for Canadian Colt carriers and that is why I asked. Again this doesn't apply to yours since that is clearly an "A". Either way, nice upper. thanks for the info, something to keep in mind in the future. |
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Quoted:
From the photos it is not a Colt carrier or bolt. You are probably on the right path with FN. The above poster is right that some Colt carriers are not marked. These would be really early Colts before there was a need to mark them. The bolts in those early carriers still have distinguishing marks that show they are Colt. Typically Colt lugs will have a diagonal line behind each lug. Also, the staking on the carrier keys of the unmarked early Colts is the different from the current type of staking. However, this doesn't apply to yours since the upper and barrel are relatively new. If the carrier was a Colt it would be marked with the "C" for the time that weapon was made. Sometimes you will see a stylized "D" which looks like an "A" for Canadian Colt carriers and that is why I asked. Again this doesn't apply to yours since that is clearly an "A". Either way, nice upper. Colt began adding the forward assist notches in 1966, and began stamping the bolt carrier with the C in 1968-1969, so it would be a very early carrier if unmarked. |
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