Standard Products Bolt Stamp - The Carbine Collector's Club

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Skippy

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Topic: Standard Products Bolt Stamp
Posted: Feb 02 2026 at 1:59pm

Hello,

I am filling out a datasheet for a Standard Products M1 Carbine and had a question about a bolt stamping.

Would you please let me know if this flat bolt is marked S6 or S9?

Appreciate the help. Thank you,

Skippy

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Posted: Feb 02 2026 at 2:31pm

Anyone's guess, unfortunately SP's bolt markings can be all over the place, horizontal, vertical, right side up, upside down. To make it more confusing the serial# ranges that both numbers were used overlap. Personally, I would go with S6.

Maybe someone else can say for sure.

Wayne
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Dan Pinto, How Can I help

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Posted: Feb 02 2026 at 5:11pm

Well this is tough as CCNL 366-6 shows an illustration of the number 12 and a S in eight possibilities.

This, in part may have been a way to bring awareness for better reporting.

With that the majority of low number bolts I have observed is the number include

4, 5, 11 (serif) 13, 12 (photo in NL) 14, 15, 19, which undoubtedly are all upright and over the S

then there is a gap to S29 which horizontal on the large lug

then S over 30

and then in the 40s I see horizontal variations with the S possibly being before or after the number.

So I am thinking it is actually 9 over S

Maybe we need to ask the members to share pictures of the SP bolts they have

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Skippy

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Posted: Feb 02 2026 at 10:06pm

I found some images of Standard Products bolts on-line, one an S 19 and the other S 28. Based on these photos my bolt is an S 9, which is unfortunate because based on CCNL # 366 the S 9 bolt is probably not correct for my 2,116,xxx Standard Products carbine.

Oh dear….

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Posted: Feb 03 2026 at 12:02am

This one is currently listed on ebay, seller is calling it a 6S.

Wayne
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Posted: Feb 03 2026 at 9:17am

Well earlier number must make it more valuable

But were they used in number order?

CCNL 366-5 as part of the StaPro update lists the bolts against serial numbers on original appearing Sta Pro carbines.

Keep in mind this is just observed, and if you have an original Sta Pro carbine I would caution to not swap anything if it appears out of place.

So the list is in earliest serial number order, but there is overlap. Early on it seems the numbers are out of order and with progressing there is still numbers out of order but a general progression.

Bolt code 6 shows 2023321 - 2224070. That is a huge swath of numbers

Bolt code 9 shows 2042644 - 20537xx

It may be how the data sheet was filled out, leaving the question, was it really a 6 or a 9.

also is the high number a case of first in, last out as by the 222 range the shape of the lug changed a bit on Sta Pro bolts.

If you look carefully at the numbers you will see many overlaps and in the OPs case of serial number 2116xxx that there is a bunch of numbers on bolts that are possible.

Maybe WB has some incite on bolt issues or maybe even receivers being used out of order.

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Skippy

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Posted: Feb 03 2026 at 10:14am

Thank you Dan and Wayne for the responses.

I am not going to worry about the bolt anymore. These Standard Products carbines are quite the puzzle. :-)

Thanks again,

Skippy

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Posted: Feb 03 2026 at 11:07am

My understanding from a long ago discussion with Mr Ricca was that when decoding Stan Pro bolts like the one Skippy has posted its read with the tail of the firing pin on the table.

Making this one a 9S.

He often described Stan bolts by number first then the S.

FWIW,

Ch-P777

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Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
Skippy Members Profile Send Private Message Find Members Posts Add to Buddy List Recruit Joined: Feb 20 2025 Location: PNW Status: Offline Points: 74	Post Options Post Reply Quote Skippy Report Post Thanks(0) Quote Reply Topic: Standard Products Bolt Stamp Posted: Feb 02 2026 at 1:59pm
	Hello, I am filling out a datasheet for a Standard Products M1 Carbine and had a question about a bolt stamping. Would you please let me know if this flat bolt is marked S6 or S9? Appreciate the help. Thank you, Skippy

W5USMC Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: Apr 29 2017 Location: Missouri Status: Offline Points: 3640	Post Options Post Reply Quote W5USMC Report Post Thanks(0) Quote Reply Posted: Feb 02 2026 at 2:31pm
	Anyone's guess, unfortunately SP's bolt markings can be all over the place, horizontal, vertical, right side up, upside down. To make it more confusing the serial# ranges that both numbers were used overlap. Personally, I would go with S6. Maybe someone else can say for sure.
	Wayne USMC Retired NRA Life Member

New2brass Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Dan Pinto, How Can I help Joined: Nov 29 2015 Location: CCC Status: Offline Points: 5527	Post Options Post Reply Quote New2brass Report Post Thanks(0) Quote Reply Posted: Feb 02 2026 at 5:11pm
	Well this is tough as CCNL 366-6 shows an illustration of the number 12 and a S in eight possibilities. This, in part may have been a way to bring awareness for better reporting. With that the majority of low number bolts I have observed is the number include 4, 5, 11 (serif) 13, 12 (photo in NL) 14, 15, 19, which undoubtedly are all upright and over the S then there is a gap to S29 which horizontal on the large lug then S over 30 and then in the 40s I see horizontal variations with the S possibly being before or after the number. So I am thinking it is actually 9 over S Maybe we need to ask the members to share pictures of the SP bolts they have
	My Wish List

Skippy Members Profile Send Private Message Find Members Posts Add to Buddy List Recruit Joined: Feb 20 2025 Location: PNW Status: Offline Points: 74	Post Options Post Reply Quote Skippy Report Post Thanks(0) Quote Reply Posted: Feb 02 2026 at 10:06pm
	I found some images of Standard Products bolts on-line, one an S 19 and the other S 28. Based on these photos my bolt is an S 9, which is unfortunate because based on CCNL # 366 the S 9 bolt is probably not correct for my 2,116,xxx Standard Products carbine. Oh dear….

W5USMC Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: Apr 29 2017 Location: Missouri Status: Offline Points: 3640	Post Options Post Reply Quote W5USMC Report Post Thanks(0) Quote Reply Posted: Feb 03 2026 at 12:02am
	This one is currently listed on ebay, seller is calling it a 6S.
	Wayne USMC Retired NRA Life Member

New2brass Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Dan Pinto, How Can I help Joined: Nov 29 2015 Location: CCC Status: Offline Points: 5527	Post Options Post Reply Quote New2brass Report Post Thanks(0) Quote Reply Posted: Feb 03 2026 at 9:17am
	Well earlier number must make it more valuable But were they used in number order? CCNL 366-5 as part of the StaPro update lists the bolts against serial numbers on original appearing Sta Pro carbines. Keep in mind this is just observed, and if you have an original Sta Pro carbine I would caution to not swap anything if it appears out of place. So the list is in earliest serial number order, but there is overlap. Early on it seems the numbers are out of order and with progressing there is still numbers out of order but a general progression. Bolt code 6 shows 2023321 - 2224070. That is a huge swath of numbers Bolt code 9 shows 2042644 - 20537xx It may be how the data sheet was filled out, leaving the question, was it really a 6 or a 9. also is the high number a case of first in, last out as by the 222 range the shape of the lug changed a bit on Sta Pro bolts. If you look carefully at the numbers you will see many overlaps and in the OPs case of serial number 2116xxx that there is a bunch of numbers on bolts that are possible. Maybe WB has some incite on bolt issues or maybe even receivers being used out of order.
	My Wish List

Skippy Members Profile Send Private Message Find Members Posts Add to Buddy List Recruit Joined: Feb 20 2025 Location: PNW Status: Offline Points: 74	Post Options Post Reply Quote Skippy Report Post Thanks(0) Quote Reply Posted: Feb 03 2026 at 10:14am
	Thank you Dan and Wayne for the responses. I am not going to worry about the bolt anymore. These Standard Products carbines are quite the puzzle. :-) Thanks again, Skippy

painter777 Members Profile Send Private Message Find Members Posts Add to Buddy List Hard Corps Joined: Feb 18 2016 Location: Central MI Status: Offline Points: 2352	Post Options Post Reply Quote painter777 Report Post Thanks(0) Quote Reply Posted: Feb 03 2026 at 11:07am
	My understanding from a long ago discussion with Mr Ricca was that when decoding Stan Pro bolts like the one Skippy has posted its read with the tail of the firing pin on the table. Making this one a 9S. He often described Stan bolts by number first then the S. FWIW, Ch-P777
	Living Free because of those that serve.....