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Posted: 6/14/2020 2:11:02 PM EDT
Hi from Switzerland,
I’m looking at a Colt government carbine (6520) for sale. The seller says it’s 100% orignal. Pics:        My problems are: - why an older style receiver extension nut? - how come an SP1 bolt (!) found its way into a 6520? What do you guys think? Thanks! |
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Posted: 6/14/2020 1:34:44 PM EDT
[#1]
Photo's are too small and grainy for me to answer questions bro.
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Posted: 6/14/2020 1:36:31 PM EDT
[#2]
Can’t you click on the pictures to get them full resolution?
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Posted: 6/14/2020 1:40:51 PM EDT
[#3]
He should be able to, I just did without and problems. Can't answer your questions though. Someone should come along and help.
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Posted: 6/14/2020 1:51:15 PM EDT
[#4]
Quoted: Hi from Switzerland, I’m looking at a Colt government carbine (6520) for sale. The seller says it’s 100% orignal. My problems are: - why an older style receiver extension nut? - how come an SP1 bolt (!) found its way into a 6520? What do you guys think? Thanks! Your pictures are coming out fine. What do you mean by “older style receiver extension nut”? Also, I do not see the photo of the SP1 bolt carrier you are asking about. If you are asking about the bolt itself, they are the same. |
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Posted: 6/14/2020 1:55:38 PM EDT
[#5]
Where are you seeing a SP-1 bolt? The bolts were the same anyway, it was the carrier that was different. As far as the receiver extension nut, well it's a Colt and anythings possible. Is it staked? Does it show signs of replacement? If that's the biggest beef, you're good to go.
M16, the nut isn't a castle nut, it uses a spanner. |
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Posted: 6/14/2020 1:57:15 PM EDT
[#6]
Looks like an early one with an early style RE lock nut. What makes you think it isn't original?
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Posted: 6/14/2020 2:01:28 PM EDT
[#7]
Quote HistoryQuoted: Your pictures are coming out fine. What do you mean by “older style receiver extension nut”? Also, I do not see the photo of the SP1 bolt carrier you are asking about. If you are asking about the bolt itself, they are the same. It has the early extension nut that you would see on an SP1 carbine, not the newer castle nut. Regarding the bolt, I’m talking about the actual bolt, not the carrier. The little canted marks behind the lugs are characteristic of the SP1 bolt. |
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Posted: 6/14/2020 2:03:52 PM EDT
[#8]
Guys,did the 6520s originally come with m4 cut extensions?
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Posted: 6/14/2020 2:04:31 PM EDT
[#9]
Quote HistoryQuoted: Looks like an early one with an early style RE lock nut. What makes you think it isn't original? I am well aware that Colt has a history of just assembling early and late parts together, but I just find the presence of such early parts on a 6520 a little strange. Maybe I’m just a little paranoid. 
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Posted: 6/14/2020 2:05:52 PM EDT
[#10]
Could be an early one. It doesn't have the block.
What's the serial number? You can XX out the last two digits. How many positions is the receiver extension? What do the lock ring stakes look like? |
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Posted: 6/14/2020 2:11:02 PM EDT
[#11]
Topic Moved
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Posted: 6/14/2020 2:13:05 PM EDT
[#12]
Quote HistoryQuoted: Could be an early one. It doesn't have the block. What's the serial number? You can XX out the last two digits. How many positions is the receiver extension? What does the lock ring stakes look like? Hmmm. But as the 6520 came out several years after the A2 sporter II (6420) which already mostly had the A2 parts, isn’t it strange? As I only have the pictures, I’m only able to see the first 2 digits : GC00XXXX. Extension is correct, 2 positions. From what I can tell, it’s staked but can’t see how it’s been done. |
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Posted: 6/14/2020 2:13:36 PM EDT
[#13]
Double tap
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Posted: 6/14/2020 2:24:29 PM EDT
[#14]
The more I look at it the more I think it's a 1988 6520.
Marked A2, but it's an A1 lower and no fence. |
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Posted: 6/14/2020 3:03:50 PM EDT
[#15]
Quote HistoryQuoted: Guys,did the 6520s originally come with m4 cut extensions? I don't think the early large front pin ones did but I could be wrong. The later guns had them. |
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Posted: 6/14/2020 3:42:58 PM EDT
[#16]
Quoted: Regarding the bolt, I’m talking about the actual bolt, not the carrier. The little canted marks behind the lugs are characteristic of the SP1 bolt. The little “canted marks” are indicative of COLT bolts, and were on ALL Colt bolts from Vietnam weapons, and all SP1’s. I’m not sure about current bolts. |
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Posted: 6/14/2020 3:51:55 PM EDT
[#17]
Quote HistoryQuoted: I am well aware that Colt has a history of just assembling early and late parts together, but I just find the presence of such early parts on a 6520 a little strange. Maybe I’m just a little paranoid. Someone would have to really work at replacing a proper castle nut w/ the early style - to what end? |
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Posted: 6/14/2020 4:37:54 PM EDT
[#18]
Quote HistoryQuoted: The little “canted marks” are indicative of COLT bolts, and were on ALL Colt bolts from Vietnam weapons, and all SP1’s. I’m not sure about current bolts. Got it, good to know! |
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Posted: 6/14/2020 4:40:46 PM EDT
[#19]
Quote HistoryQuoted: Someone would have to really work at replacing a proper castle nut w/ the early style - to what end? Well, you got a good point there. Looks definitely original, then.  Thanks everybody! |
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Posted: 6/14/2020 5:11:51 PM EDT
[#20]
Quote HistoryQuoted: It has the early extension nut that you would see on an SP1 carbine, not the newer castle nut. Regarding the bolt, I’m talking about the actual bolt, not the carrier. The little canted marks behind the lugs are characteristic of the SP1 bolt. That's just where the tooling cut as it travelled around the rear of lugs. Typical of '90s and older Colt bolts. Newer bolts do not share that characteristic. Not sure if it was unique to bolts actually produced by Colt or a subcontractor. |
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Posted: 6/14/2020 5:31:49 PM EDT
[#21]
Ok, here’s my 1988 transitional one, identical to yours except for markings, still marked Sporter II, that would be a R6420. I wrote to Colt who answered that their records indicate that this rifle left as a Government Carbine Model # R6520. I would guess they were built just a few months apart. I am also in Switzerland
 Attached File Attached File Attached FileThe rifle you showed seems fine to me. From my experience those kind of older rifles do not show up for sale that often in our country. I would be all over it if I didn’t already have one. Fyi I paid CHF 1700 for mine in 2014, with a cheap Chinese scope, a rifle pouch and 400 rounds of nice South African ammo. Prices might be a bit softer nowadays. |
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Posted: 6/26/2020 2:33:52 AM EDT
[#22]
FYI, Colt receiver extension nut stakes are always square. If they are round then it has probably been messed with.
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Posted: 6/26/2020 12:35:41 PM EDT
[#23]
Components are correct, though the photographs don't show enough (e.g.,) stake marks, to say that it's 100% original and unmolested, however the features would be consistent with that vintage of rifle.
The 6520 was built during a pretty transitional era, not just for commercial production, but also during the development of the 700-series carbines and XM4 program, and would institute production changes and components from the production of R0720 (XM4) and R0727 carbines chiefly, so the 6520, while "generally" having the same features could have a wide variety of components and configurations. The M4-style "castle nut" was not implemented until the 1990s and was a XM4 development, as was the four position receiver extension. The 6520 pictured looks fairly early, with slab-side, large pin, A1 forging, non-sear block receiver, which would also make an SP1-style cut bolt carrier correct. Pre-M4 lock nut, two position receiver extension, and early carbine buffer would all be correct, as would no extended feedramps, which also came about during XM4 development. ~Augee |
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