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Posted: 7/27/2016 1:23:50 PM EDT
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Posted: 7/27/2016 1:31:45 PM EDT
[#1]
Yes it does. The "+" can even be found on early SP1 receivers (it is on my 1968 SP1).
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Posted: 7/27/2016 1:31:58 PM EDT
[#2]
They appeared only on very early forgings - might have been a witness mark for the machining process or something like that, which they later found out wasn't needed.
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Posted: 7/27/2016 1:44:16 PM EDT
[#3]
I've seen them on 601/602 receivers, but was unaware that they were also on early 603/604 partial-fence receivers......thanks for the info
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Posted: 7/27/2016 1:46:41 PM EDT
[#4]
What rifles are those? Interesting to see a partial fence lower with A2 uppers. I'd like to see the whole group, do you have more pics?
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Posted: 7/27/2016 2:22:19 PM EDT
[#5]
Those are USAF M16A2 rebuilds.....converted USAF 604's.....
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Posted: 7/27/2016 3:05:26 PM EDT
[#6]
More pictures please.
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Posted: 7/27/2016 3:35:10 PM EDT
[#7]
Quote HistoryQuoted:
They appeared only on very early forgings - might have been a witness mark for the machining process or something like that, which they later found out wasn't needed. gas tube insertion identifier?(since you could see the tube with the dust cover open?) |
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Posted: 7/27/2016 3:50:53 PM EDT
[#8]
Quote HistoryQuoted:
gas tube insertion identifier?(since you could see the tube with the dust cover open?) Quote HistoryQuoted:
Quoted:
They appeared only on very early forgings - might have been a witness mark for the machining process or something like that, which they later found out wasn't needed. gas tube insertion identifier?(since you could see the tube with the dust cover open?) Port cover would have covered up the mark when it was open, though... |
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Posted: 7/27/2016 4:19:26 PM EDT
[#9]
Quote HistoryQuoted:
They appeared only on very early forgings - might have been a witness mark for the machining process or something like that, which they later found out wasn't needed. This is my understanding too. |
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Posted: 7/27/2016 4:50:32 PM EDT
[#10]
Quote HistoryQuoted: This is my understanding too. Quote HistoryQuoted: Quoted: They appeared only on very early forgings - might have been a witness mark for the machining process or something like that, which they later found out wasn't needed. This is my understanding too. http://gdtseminars.com/blog/ I have one on an XM16 Demil lower too Edit: That lower requires a TO mod for a pivot pin detent weep-hole too.  Whats the marking on it 602, M16? My money is on 602. Please do show us, we are short on good pics of 602s  |
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Posted: 7/27/2016 4:54:15 PM EDT
[#11]
Im going to say very early vintage, There is no drain hole in the spring/pin retainer tube (m16a1 improvement)
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Posted: 7/27/2016 5:05:15 PM EDT
[#12]
Quote HistoryQuoted:
Datum mark for GD&T Geometric Dimension and Tolerance. At least this was my assumption too. http://gdtseminars.com/blog/ I have one on an XM16 Demil lower too Edit: That lower requires a TO mod for a pivot pin detent weep-hole too.
Whats the marking on it 602, M16? My money is on 602. Please do show us, we are short on good pics of 602s
Quote HistoryQuoted:
Quoted:
Quoted:
They appeared only on very early forgings - might have been a witness mark for the machining process or something like that, which they later found out wasn't needed. This is my understanding too. http://gdtseminars.com/blog/ I have one on an XM16 Demil lower too Edit: That lower requires a TO mod for a pivot pin detent weep-hole too.
Whats the marking on it 602, M16? My money is on 602. Please do show us, we are short on good pics of 602s
Partial fence. It's an early XM16E1 or 604 |
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Posted: 7/27/2016 5:14:02 PM EDT
[#13]
My understanding was the contract AF Colt 604's had a mix of partial fence and full fence lowers. Most of the rebuilt AF M16A2's I've worked on were either 604 partial or full fence lowers, however, I still run into 601/602 rebuilt to M16A2 configuration
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Posted: 7/27/2016 8:15:13 PM EDT
[#14]
I like the DAS stamp!
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Posted: 7/27/2016 11:30:21 PM EDT
[#15]
My God that is awesome. I love:
- the + symbol on a partial fence - what appears to be an acceptance stamp - the round UID or whatever it's called sticker indicating the weapon is likely still in service Please please please post more pics. Posted Via AR15.Com Mobile |
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Posted: 7/28/2016 11:09:36 AM EDT
[#16]
Quote HistoryQuoted: My God that is awesome. I love: - the + symbol on a partial fence - what appears to be an acceptance stamp - the round UID or whatever it's called sticker indicating the weapon is likely still in service Please please please post more pics. Posted Via AR15.Com Mobile You know thinking about the + last night I don't even know if the GD&T symbols were in use in the early 60s. I haven't seen an early print of the M16 even though I've searched. I know its not on the new one. I think the old symbol may have been / or // Not sure. Why did I say 602...  The round IUID stickers are AF only from what I understand. Everyone else is square or rectangle, they have only been using them since about 2012-13 in the AF I believe. |
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Posted: 7/28/2016 4:25:55 PM EDT
[#18]
Quote HistoryQuoted:
How about a 602 spotted in the wild..... <a href="http://s1104.photobucket.com/user/cafejeeper/media/Mobile%20Uploads/image_zpsj76cvuci.jpeg.html" target="_blank">http://i1104.photobucket.com/albums/h336/cafejeeper/Mobile%20Uploads/image_zpsj76cvuci.jpeg</a> <a href="http://s1104.photobucket.com/user/cafejeeper/media/Mobile%20Uploads/image_zpsgr1zi54j.jpeg.html" target="_blank">http://i1104.photobucket.com/albums/h336/cafejeeper/Mobile%20Uploads/image_zpsgr1zi54j.jpeg</a> I like that |
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Posted: 7/28/2016 4:49:42 PM EDT
[#19]
Thanks for sharing!
Its beautiful! |
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Posted: 7/28/2016 5:54:42 PM EDT
[#21]
Quote HistoryQuoted:
How about a pile of 602's <a href="http://s1104.photobucket.com/user/cafejeeper/media/Mobile%20Uploads/image_zpskfyecugv.jpeg.html" target="_blank">http://i1104.photobucket.com/albums/h336/cafejeeper/Mobile%20Uploads/image_zpskfyecugv.jpeg</a> Sad, very sad, they engraved the back side of the receivers "safe, semi, & auto". I've seen that on M16A1's as well. |
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Posted: 7/28/2016 6:20:38 PM EDT
[#22]
wow I didn't think there were that many 602's floatin around, much less still in action! That is really someting
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Posted: 7/28/2016 9:45:44 PM EDT
[#23]
Looks like there holding up good.
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Posted: 7/28/2016 9:55:29 PM EDT
[#24]
RICO,
Can you share if those are still in military service or if they are being moth balled for emergency back stock or if they are headed out to be destroyed or what? Thanks |
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Posted: 7/28/2016 10:35:17 PM EDT
[#25]
Quote HistoryQuoted:
Sad, very sad, they engraved the back side of the receivers "safe, semi, & auto". I've seen that on M16A1's as well. Quote HistoryQuoted:
Quoted:
How about a pile of 602's <a href="http://s1104.photobucket.com/user/cafejeeper/media/Mobile%20Uploads/image_zpskfyecugv.jpeg.html" target="_blank">http://i1104.photobucket.com/albums/h336/cafejeeper/Mobile%20Uploads/image_zpskfyecugv.jpeg</a> Sad, very sad, they engraved the back side of the receivers "safe, semi, & auto". I've seen that on M16A1's as well. I think I found my next clone build inspiration. Maybe reprofile an 80% into one of these and do an arsenal rebuild complete w/ electropencil selector markings. I love that they are still in use after what like 50 years!? Best part is outside of the lower & LPK, all the other stuff is easily acquired. Posted Via AR15.Com Mobile |
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Posted: 7/29/2016 1:38:39 AM EDT
[#26]
From what I understand the USAF can no longer deploy the 601/602 series of receivers due to the lack of removeable front pivot assemblies available thru the supply chain via NSN. These 602's are kept separate from deployable 604 receivered M16A2 conversions. Eventually, they'll get turned in to the supply chain for serviceable M16A2's or current issue M4 Carbines. After turn-in, it'll be up to Big AF to decide if these 602's will be returned to national stock, or removed from inventory.
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Posted: 7/29/2016 8:32:46 AM EDT
[#27]
Quote HistoryQuoted:
Yes it does. The "+" can even be found on early SP1 receivers (it is on my 1968 SP1). What he saide. It's a slick side, never seen one on a fenced lower. |
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Posted: 7/29/2016 4:25:06 PM EDT
[#28]
Quote HistoryQuoted:
Port cover would have covered up the mark when it was open, though... Quote HistoryQuoted:
Quoted:
Quoted:
They appeared only on very early forgings - might have been a witness mark for the machining process or something like that, which they later found out wasn't needed. gas tube insertion identifier?(since you could see the tube with the dust cover open?) Port cover would have covered up the mark when it was open, though... true, but only when it was ALL THE WAY open, clearly, you'd be able to hold the cover in a position to verify alignment the gas tube. |
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Posted: 8/1/2016 5:38:14 PM EDT
[#29]
Tag for more pics
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Posted: 8/3/2016 10:54:45 PM EDT
[#30]
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Posted: 8/3/2016 10:59:44 PM EDT
[#31]
Quote HistoryQuoted:
OK, how about this...... <a href="http://s1104.photobucket.com/user/cafejeeper/media/Mobile%20Uploads/image_zps12q2yvcb.jpeg.html" target="_blank">http://i1104.photobucket.com/albums/h336/cafejeeper/Mobile%20Uploads/image_zps12q2yvcb.jpeg</a> Sad to see that this was done...... Interesting that a low serial number 602 has the type 3 as opposed to type 2 bolt catch. Thanks for posting! Do these A2 uppers have the front pivot lug recessed out to accept the non-captured type 601/602 pivot pin? |
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Posted: 8/3/2016 11:06:32 PM EDT
[#32]
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Posted: 8/3/2016 11:10:55 PM EDT
[#33]
Quote HistoryQuoted:
Yes, there is a pivot pin lug recess to accommodate the 601/602 pivot pin assembly <a href="http://s1104.photobucket.com/user/cafejeeper/media/Mobile%20Uploads/image_zpsa6rza0tl.jpeg.html" target="_blank">http://i1104.photobucket.com/albums/h336/cafejeeper/Mobile%20Uploads/image_zpsa6rza0tl.jpeg</a> Was that part of the manufacturing process or done on base depending on which type of lower it was going on? |
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Posted: 8/3/2016 11:35:36 PM EDT
[#34]
Quote HistoryQuoted:
<a href="http://s1104.photobucket.com/user/cafejeeper/media/Mobile%20Uploads/image_zps9jpfajy8.jpeg.html" target="_blank">http://i1104.photobucket.com/albums/h336/cafejeeper/Mobile%20Uploads/image_zps9jpfajy8.jpeg</a> Yet, even worse..... Brust.  
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Posted: 8/4/2016 12:43:37 AM EDT
[#35]
From the examples I've seen, all the M16A2 upper receivers used in the USAF M16 to M16A2 conversion process were recessed at the pivot pin lug to accommodate the 601/602 lowers receiver.
Quote HistoryQuoted:
Was that part of the manufacturing process or done on base depending on which type of lower it was going on? Quote HistoryQuoted:
Quoted:
Yes, there is a pivot pin lug recess to accommodate the 601/602 pivot pin assembly <a href="http://s1104.photobucket.com/user/cafejeeper/media/Mobile%20Uploads/image_zpsa6rza0tl.jpeg.html" target="_blank">http://i1104.photobucket.com/albums/h336/cafejeeper/Mobile%20Uploads/image_zpsa6rza0tl.jpeg</a> Was that part of the manufacturing process or done on base depending on which type of lower it was going on? |
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Posted: 8/4/2016 12:57:59 AM EDT
[#36]
Quote HistoryQuoted:
Brust. Quote HistoryQuoted:
Quoted:
<a href="http://s1104.photobucket.com/user/cafejeeper/media/Mobile%20Uploads/image_zps9jpfajy8.jpeg.html" target="_blank">http://i1104.photobucket.com/albums/h336/cafejeeper/Mobile%20Uploads/image_zps9jpfajy8.jpeg</a> Yet, even worse..... Brust. I'm totally gonna incorporate the electro pencil misspelling on my clone. Posted Via AR15.Com Mobile |
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Posted: 8/4/2016 1:06:06 AM EDT
[#37]
Quote HistoryQuoted:
From what I understand the USAF can no longer deploy the 601/602 series of receivers due to the lack of removeable front pivot assemblies available thru the supply chain via NSN. These 602's are kept separate from deployable 604 receivered M16A2 conversions. Eventually, they'll get turned in to the supply chain for serviceable M16A2's or current issue M4 Carbines. After turn-in, it'll be up to Big AF to decide if these 602's will be returned to national stock, or removed from inventory. Rico: I would like to be the first to congratulate you on breaking the 100 post barrier in less than 16 years. Nice work! |
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