Inland Flat Bolt Production

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   This has probably already been done but maybe somebody will have some interest. This information came from War Baby by Larry Ruth. These are the markings and manufacturing dates for Inland Type II flat bolts. Not all of the bolts had the exact months of production.  All these bolts have the reinforced web area and are marked on the left lug.
OI Fall 42- Summer 43.
Upside Down A.I. Summer 43.
Upside Down O.I. W/Sideways 1. 10/43-1/44.
Upside Down O.I. W/Sideways 2. 11/43-3/44.
Upside Down O.I. W/Sideways 3. 7/43-9/44.
Upside Down A.I. W/Sideways 1. 11/43.
Upside Down A.I. W/Sideways 3. 10/43. 

I believe OI were made possibly by S.E. Overton Company South Haven, Michigan but I could not confirm it in War Baby.
A.I. were made by Dayton Racquet Company. Arcanum, Ohio. This information came from this site.
The book didn't address an A.I. with a sideways 2 but it did state the numbers do not appear to follow any discernable orderly pattern with regard to date or SSN.  Anything that is incorrect, please correct. I am no expert but just wanted to contribute something to the site. Thank you, David

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Hogcoach Members Profile Send Private Message Find Members Posts Add to Buddy List Recruit Joined: Apr 30 2024 Location: Missouri Status: Offline Points: 31	Post Options Post Reply Quote Hogcoach Report Post Thanks(0) Quote Reply Topic: Inland Flat Bolt Production Posted: Jan 20 2026 at 4:24pm
	This has probably already been done but maybe somebody will have some interest. This information came from War Baby by Larry Ruth. These are the markings and manufacturing dates for Inland Type II flat bolts. Not all of the bolts had the exact months of production. All these bolts have the reinforced web area and are marked on the left lug. OI Fall 42- Summer 43. Upside Down A.I. Summer 43. Upside Down O.I. W/Sideways 1. 10/43-1/44. Upside Down O.I. W/Sideways 2. 11/43-3/44. Upside Down O.I. W/Sideways 3. 7/43-9/44. Upside Down A.I. W/Sideways 1. 11/43. Upside Down A.I. W/Sideways 3. 10/43. I believe OI were made possibly by S.E. Overton Company South Haven, Michigan but I could not confirm it in War Baby. A.I. were made by Dayton Racquet Company. Arcanum, Ohio. This information came from this site. The book didn't address an A.I. with a sideways 2 but it did state the numbers do not appear to follow any discernable orderly pattern with regard to date or SSN. Anything that is incorrect, please correct. I am no expert but just wanted to contribute something to the site. Thank you, David

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: Jan 20 2026 at 5:24pm
	The OI bolts were made by Monarch Marking Systems, Dayton OH not S.E. Overton. See WB III page 1144. Edited by W5USMC - Jan 20 2026 at 5:43pm
	Wayne USMC Retired NRA Life Member

Hogcoach Members Profile Send Private Message Find Members Posts Add to Buddy List Recruit Joined: Apr 30 2024 Location: Missouri Status: Offline Points: 31	Post Options Post Reply Quote Hogcoach Report Post Thanks(0) Quote Reply Posted: Jan 20 2026 at 9:24pm
	Thanks Wayne. I don't have WBIII and WBI just had just had a question mark for the code for Inland bolts including Monarch Marking Systems. David

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: Jan 24 2026 at 1:23pm
	Missing from the list CCNL 346-13 OI in circle. DI CCNL 353-8 you will find that the lug shape changed. In some cases the same marking was used as the OP pointed out.
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Hogcoach Members Profile Send Private Message Find Members Posts Add to Buddy List Recruit Joined: Apr 30 2024 Location: Missouri Status: Offline Points: 31	Post Options Post Reply Quote Hogcoach Report Post Thanks(0) Quote Reply Posted: Jan 24 2026 at 2:56pm
	In WB 1 it lists OI with a circle as the Type I Variation. It is correct for Type II also according to the Riesch book. Unfortunately, WBI doesn't have the manufacturer for Circle OI. Maybe it is listed in WBIII and Wayne could help out. It also doesn't have the company name for DI under the bolts listing, but it is listed as Dayton Mold Company. Dayton, Ohio* for the production of the recoil plate if that it is the same company. The OI Circle were marked on the right lug; the OI were on the left lug.

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: Jan 24 2026 at 3:20pm
	D is not always D! It may be Dayton Racket Co. as the DI preceded the AI. There is also a SI bolt, but never reported on an original carbine. Listed contractor was Standard Computer Scale Company, who did make bolts for IBM marked SB Olsen Brothers reportedly made firing pins for Inland marked SI. So S is not always S Types, Larry has a unique system. Riesch types may not match other systems. The club tried to stay away from types and referred to the datasheets. We did use number systems such as with describing slides. This is where Riesch fell short. https://www.uscarbinecal30.com/forum/operating-slide-chart_topic1140.html For the most part when we came online we have been using Riesch for the most part as most were familiar with the types. Here is another example of where I believe Riesch has it wrong. What he calls the type 1 bolt, meaning without the strengthening web, I do not believe was ever marked*. Maybe Marty or Marcus can add to that. Win 0 had no web, but nothing was marked with a W Another believed pre production Winchester came across the desk last year. Unfortunately the owner did not share further information. The bolt problem was discovered in testing and bolt modified. Several 3 digit Inland carbines had no markings on the bolt and can be found on this forum. https://www.uscarbinecal30.com/forum/carbine-of-interest-inland-270_topic5734.html https://www.uscarbinecal30.com/forum/featured-carbine-inland-292-lt-general-hubener_topic7477.html After that the IO in circle appeared (with web) I have never seen a IO in circle absent the web, but I will add, "Never say Never" Edited by New2brass - Jan 24 2026 at 3:42pm
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Hogcoach Members Profile Send Private Message Find Members Posts Add to Buddy List Recruit Joined: Apr 30 2024 Location: Missouri Status: Offline Points: 31	Post Options Post Reply Quote Hogcoach Report Post Thanks(0) Quote Reply Posted: Jan 24 2026 at 8:22pm
	Thank you for the great insight. I find this fascinating. My carbine library needs to expand for sure.