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Posted: 8/25/2010 7:24:48 PM EDT
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I was looking at two of my uppers a few minutes ago, and noticed that some of the numbers on the sight wheels are styled differently. This may or may not be significant, but I thought it was interesting enough to post.
Notice the numbers "3" and the "5" on both sight wheels. Sight wheel on my '66 vintage (I believe) 603 upper: 
Sight wheel on my later C H forge code 603 upper: 
ETA: The directional arrows on the uppers are different as well, but that's expected. |
| I've noticed this too but haven't tried to keep track of the variations. I have what I believe to be a very original '65 vintage 604 upper (square forge, "M VP" barrel, forge below ejection port does not line up with lower) a well used '66 vintage 603 upper (square forge, "MP" barrel) and a very original CMPC barreled 604 upper. I'll take pictures and post them later. |
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of course you know that real retro sight wheels don't have numbers at all 
http://i151.photobucket.com/albums/s147/crackedcornish/e89cf08d-1.jpg Way to show of, crackedcornish. 
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"a very original '65 vintage 604 upper (square forge, "M VP" barrel, forge below ejection port does not line up with lower) a well used '66 vintage 603 upper (square forge, "MP" barrel)" Have any photos of those forge marks on a 603 Colt receiver? That receiver wouldn't have any forge markings, only proof marks forward of the ejection port. |
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"a very original '65 vintage 604 upper (square forge, "M VP" barrel, forge below ejection port does not line up with lower) a well used '66 vintage 603 upper (square forge, "MP" barrel)" Have any photos of those forge marks on a 603 Colt receiver? Those 2 receivers will not have forge codes on them.Are you asking for pics of the differences between very early square forge and square forge? Or are you asking if those combinations above are correct? If asking,then the above are both correct.A very early square forge (upper lines with lower) if unmessed with will have an M vp marked barrel and can have either the cast front site base (raised arrow and up) or a forged FSB. |
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If you're talking about proof marks I may have pictures already. I don't know if its another detail that's been beat to death but there are variations in proof marks. "Early" square forge uppers will have proof marks in varying relations while "late" square forge uppers were the first to have proof marks in a fixed distance and orientation. Have you noticed this?
Have any photos of those forge marks on a 603 Colt receiver?
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| Are these sharp forging lines that unique to 603 and 604 uppers? I have a 603 upper with a radiused forging line and askew proof marks and a 603 with a straight forging line and typical later proof marking configuration. Is there a time line in the relative short period these forgings without forge marks were produced? |
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Are these sharp forging lines that unique to 603 and 604 uppers? I have a 603 upper with a radiused forging line and askew proof marks and a 603 with a straight forging line and typical later proof marking configuration. Is there a time line in the relative short period these forgings without forge marks were produced? more 603 info.... http://www.ar15.com/forums/topic.html?b=3&f=123&t=401263 and guys if you look at the close ups of the pics showing the various forge marks, you may notice something interesting with the sightwheels |
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Are these sharp forging lines that unique to 603 and 604 uppers? I have a 603 upper with a radiused forging line and askew proof marks and a 603 with a straight forging line and typical later proof marking configuration. Is there a time line in the relative short period these forgings without forge marks were produced? more 603 info.... http://www.ar15.com/forums/topic.html?b=3&f=123&t=401263 and guys if you look at the close ups of the pics showing the various forge marks, you may notice something interesting with the sightwheels Only thing I see is the differences in the numbers, and one of the sight wheels has larger digits. Is that it? |
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Are these sharp forging lines that unique to 603 and 604 uppers? I have a 603 upper with a radiused forging line and askew proof marks and a 603 with a straight forging line and typical later proof marking configuration. Is there a time line in the relative short period these forgings without forge marks were produced? more 603 info.... http://www.ar15.com/forums/topic.html?b=3&f=123&t=401263 and guys if you look at the close ups of the pics showing the various forge marks, you may notice something interesting with the sightwheels Only thing I see is the differences in the numbers, and one of the sight wheels has larger digits. Is that it? notice the dates...early had the flat topped three, "72-'73 could be either flat or round (depending on upper forge mark/using up stock on hand?), later was small numbered....now admittedly that is just based on the examples shown in those pics, but it is something to think about |
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Are these sharp forging lines that unique to 603 and 604 uppers? I have a 603 upper with a radiused forging line and askew proof marks and a 603 with a straight forging line and typical later proof marking configuration. Is there a time line in the relative short period these forgings without forge marks were produced? more 603 info.... http://www.ar15.com/forums/topic.html?b=3&f=123&t=401263 and guys if you look at the close ups of the pics showing the various forge marks, you may notice something interesting with the sightwheels Only thing I see is the differences in the numbers, and one of the sight wheels has larger digits. Is that it? notice the dates...early had the flat topped three, "72-'73 could be either flat or round (depending on upper forge mark/using up stock on hand?), later was small numbered....now admittedly that is just based on the examples shown in those pics, but it is something to think about Haha! I did notice that, but wrote it off when I saw that the third model (C M forge) reverted back to the flat top "3" from the round "3". |
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Are these sharp forging lines that unique to 603 and 604 uppers? I have a 603 upper with a radiused forging line and askew proof marks and a 603 with a straight forging line and typical later proof marking configuration. Is there a time line in the relative short period these forgings without forge marks were produced? more 603 info.... http://www.ar15.com/forums/topic.html?b=3&f=123&t=401263 and guys if you look at the close ups of the pics showing the various forge marks, you may notice something interesting with the sightwheels Only thing I see is the differences in the numbers, and one of the sight wheels has larger digits. Is that it? notice the dates...early had the flat topped three, "72-'73 could be either flat or round (depending on upper forge mark/using up stock on hand?), later was small numbered....now admittedly that is just based on the examples shown in those pics, but it is something to think about Haha! I did notice that, but wrote it off when I saw that the third model (C M forge) reverted back to the flat top "3" from the round "3". maybe since CM was the alternate, they got the leftovers? |
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Are these sharp forging lines that unique to 603 and 604 uppers? I have a 603 upper with a radiused forging line and askew proof marks and a 603 with a straight forging line and typical later proof marking configuration. Is there a time line in the relative short period these forgings without forge marks were produced? more 603 info.... http://www.ar15.com/forums/topic.html?b=3&f=123&t=401263 and guys if you look at the close ups of the pics showing the various forge marks, you may notice something interesting with the sightwheels Only thing I see is the differences in the numbers, and one of the sight wheels has larger digits. Is that it? notice the dates...early had the flat topped three, "72-'73 could be either flat or round (depending on upper forge mark/using up stock on hand?), later was small numbered....now admittedly that is just based on the examples shown in those pics, but it is something to think about Haha! I did notice that, but wrote it off when I saw that the third model (C M forge) reverted back to the flat top "3" from the round "3". maybe since CM was the alternate, they got the leftovers? GUTS probably has it right. Different subcontractors probably. |
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of course you know that real retro sight wheels don't have numbers at al
And just where might a person start to look for one of these Cracked? our friend Heatnbeat makes a very, very nice reproduction 
....or you can do like I did and buy a lot of upper receivers over the years, and get lucky with one
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