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Posted: 1/28/2009 11:43:35 AM EDT
I have a list of forge codes kindly supplied to me by VAAR - and I see that a splintered A means Anchor Harvey Aluminum - but IIRC, this means this C7 upper is a commercial upper correct? Is there anyway to differentiate it from being DPMS or Bushy? Should I really care? 
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I don't think there is. Keep in mind there were reports that some of the DPMS receivers had out of spec charging handle channels. IIRC, it was the DPMS charging handles themselves that are out of spec - am I just remembering wrong? I'll have to try a Colt CH in it. Just did - fits fine. So, I thought all Colt contract C& stuff was marked CK or DK? (Just goin by memory) It seems like a decent upper quality wise. Just wondering what it is. |
Anchor Harvey did C7 type forgings for DPMS, Bushie, AND Colt.. The Colt pieces have the "C" along side the forge mark. Somewhere on this site there's a picture of one, but I can't give you a reference. .
Re the first batch of DPMS pieces, the initial pieces were undersized in both the main bore and the cocking piece slot. They salvaged the things by reaming the main bore to the right size, but didn't do anything w/the upper slot. They just built up slightly smaller handles. Also, Anchor didn't forge in the "R" under the windage arrow. I thought initially that was just on DPMS pieces, but have since seen it on Bushie units, and that pic of a Colt unit I mentioned above was also "R less" I've got one of the DPMS pieces w/the reamed out bore (you can see the tool marks from the reamer quite clearly), and initially it wouldn't take a Colt cocking piece. After playing w/the thing for awhile I realized that the problem is with the space for the two little retaining lugs on the handle is where the upper is too small. Filing a slight angle on the bottom of the lugs, and reducing the height of that little hump at the top of the handle, right at the front, by a few thousanths, allows the handle to fit just fine. And it's still perfectly usable in other uppers, if I decide to swap it around 
That lets me use the forged Colt cocking piece w/my second issue Israeli profile unit, and saved me having to have a stamped DPMS handle reanodized along w/the upper reciever.
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I'm not exactly sure what your question is.
C7 uppers (I'm talking the real deal) were produced by both Colt and Diemaco. Various forges supplied the forgings so pretty much anything can be encountered, however real ones will also have the C or stylized D to the left of the forge code, or the Colt proof mark beside the ejection port. The same holds true of any style of upper, unless their is a manufacturers mark along with the forge code it's impossible to tell who made it. One forge could supply forgings to Colt, Olympic, and DPMS, it is not an indication of quality since the machining can vary wildly between manufacturers. |
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Quoted:
I'm not exactly sure what your question is. C7 uppers (I'm talking the real deal) were produced by both Colt and Diemaco. Various forges supplied the forgings so pretty much anything can be encountered, however real ones will also have the C or stylized D to the left of the forge code, or the Colt proof mark beside the ejection port. The same holds true of any style of upper, unless their is a manufacturers mark along with the forge code it's impossible to tell who made it. One forge could supply forgings to Colt, Olympic, and DPMS, it is not an indication of quality since the machining can vary wildly between manufacturers. You guys have pretty much answered it - I was just curious. Got any pics of Canadian Army C7's or C8's to share with us? (Besides what we've seen on Diemaco's website I mean.) |
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Don't have anything handy at the moment.
I've been meaning to take some pictures of the original C8's that we still have kicking around. Most still have the original 2 pos aluminum stock, some have fiberlite as replacements. I really want a photo of the one C8 I saw that had both the C and D marks along with the forge code, very weird, the marks were half the size they would normally be. |
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Leg - IIRC, some of the C7's were built using ltwt profile barrels before they started using the M203 adapter ring. We'd love to see any pics of Canadian ARs you can come up with.
Shade - I know what you mean - this is my 3rd C7 upper and I decided I just wasn't going to part with it. If I only had all the A1 uppers I'd sold off or traded in the last several years... ETA: Leg - do you know by any chance if Marstar or similiar outfits carry 2-pos Aluminum stocks? Just a thought. |
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