Posted: 5/2/2013 7:06:48 PM EDT
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I recently purchased a colt bcg from the EE, the ad stated virtually no wear and rated at 98%. I received it and noticed a few differences than my 6920 bcg.
C marked carrier 
The staking raises my main concern 
Overall tooling marks are very noticeable and the finish is smooth compared to 6920 bcg 
The back end is more rounded off as well, 6920 top...bcg in question on bottom 
MPC marked...the "M" and "P" run together 
Is this an older generation colt bcg? What's the deal with the staking? |
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I have a 6721 manufactured in 1994/1995 and I just took a look at the BCG.
It is flat in the rear like your verified Colt carrier in the picture. The MPC stamp does not have the MP smashed together like that, it looks the same as the new ones. Since I have an older generation BCG here, let me know if you want any other details, but my older gen. seems to be the same as the one from your 6920. With Colt though, I think just about anything is possible.. |
| OP you probably have an older Colt BCG. The wear looks like many an M16A2 I've worked on after so many rounds. IMHO it is not a bad thing. These older BCGs run butter smooth with no grit or friction like a new BCG. Based on the markings, it is either an older Colt, or a very well-done forgery. The MPC with the MP together is also standard for older BCG's I've seen. None of your pictures covered the important parts anyway...what does the bolt look like? The bolt face will tell you it's age better than anything else. |
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Quoted:
Also there are diagonal marks behind each lug on the bolt. https://lh5.googleusercontent.com/-88nEi9CVsKs/UaNnupaDk1I/AAAAAAAABQQ/F1fCj6mDvp0/s800/image.jpg https://lh5.googleusercontent.com/-jcESxn89RDc/UaNnwrlLrhI/AAAAAAAABQc/BnS4-n9nOvE/s800/image.jpg I too have recently acquired a Colt bcg with the same bolt, not having the MP marking but a C marking. It looks good and feels good in the carrier but was also curious about the tags behind the lugs and the missing MP. The F/A carrier does have the C, a properly staked key and appears genuine. TIA |
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The bolt and carrier look like a genuine Colt post transitional carrier approx. 1966-1967 manufacture to me. At minimum, I can not tell if the gas key has been removed, the gas key screws have been turned since it was factory staked, and it has been re-staked with a MOACKS staking tool.
A visual inspection of the gas rings is an indicator of wear. It might tell you if the bcg is actually "virtually no wear". The gas rings may be brand new, you can tell with a magnifying glass. There's the old upside down gas rings test too. When assembled and the bolt is forward if you stand the carrier up on the bolt vertically does the carrier stay up? Or does it come down on the bolt due to its own weight? The fit between the bolt, gas rings and carrier should be able to hold it up. The diagonal cuts in the bolt are normal. I've heard two things about them. One that they just happen to occur during manufacturing. And that they are stress relief cuts. I don't know what they are. Not all bolts have them. Most that I have seen have them. Yes, bolts and carriers are re--parked / refinished regularly. -William |