The Carbine Collectors Club

Click on the image above to learn more about the M1 Carbine


Forum Home Forum Home > The Club > General Discussion > Parts Markings
  New Posts New Posts
  FAQ FAQ  Forum Search   Register Register  Login Login


Underwood Single notch receivers ?

 Post Reply Post Reply
Author
Message
painter777 View Drop Down
Hard Corps
Hard Corps
Avatar

Joined: Feb 18 2016
Location: Central MI
Status: Offline
Points: 656
Post Options Post Options   Thanks (0) Thanks(0)   Quote painter777 Quote  Post ReplyReply Direct Link To This Post Topic: Underwood Single notch receivers ?
    Posted: Jul 05 2020 at 4:25pm
Early (1st Ser Block) Underwood can be found with just the one forward notch on the receiver rail.
Do we know about what serial range they went with the 2 notches?

Also I believe (IIRC) they always used the rear square cut on that rail.
I think I've seen this rear mill cut in narrow and wide.

Did the width of this mill cut go from wide to narrow..... or narrow to wide ?
When the 2 slide rail notches became the norm, did it coincide with the timing of changing the mill cut width  ?

I don't want to wander in to the Sub supplied receivers just yet, trying not to complicate this any further. Unless the changes occurred 'Because' of the Sub supplied receivers.

I hope this makes sense.

Appreciate any input,

Charlie-P777
Living Free because of those that serve.....
Back to Top
New2brass View Drop Down
Moderator Group
Moderator Group
Avatar
Dan Pinto, Photo Editor

Joined: Nov 29 2015
Location: CT
Status: Offline
Points: 2684
Post Options Post Options   Thanks (0) Thanks(0)   Quote New2brass Quote  Post ReplyReply Direct Link To This Post Posted: Jul 06 2020 at 10:30am
1350209

Sounds like your receiver is an Inland

I misread and thought Charlie suggested it was a round notch. My error.

Inland supplied the first 100 receivers used by Underwood and they had one notch and round detail.

According to CCNL 127 Underwood had one notch to about 1,428,000 with the first reported double notch at 1,444,xxx

there is 2 other newsletter on receiver construction features that shows Underwood having 1/4 to 5/16 inch distance early in the first block. At about 1.441 up it went to 5/8 to 3/4 of an inch

So I would say the double notch and end width came about in the same time period.



Edited by New2brass - Jul 06 2020 at 12:21pm
Back to Top
W5USMC View Drop Down
Hard Corps
Hard Corps
Avatar

Joined: Apr 29 2017
Location: Missouri
Status: Offline
Points: 1356
Post Options Post Options   Thanks (0) Thanks(0)   Quote W5USMC Quote  Post ReplyReply Direct Link To This Post Posted: Jul 06 2020 at 11:41am
Originally posted by New2brass New2brass wrote:

1350209

Dan, What does this serial represent?
Wayne
USMC Retired
NRA Life Member
Back to Top
New2brass View Drop Down
Moderator Group
Moderator Group
Avatar
Dan Pinto, Photo Editor

Joined: Nov 29 2015
Location: CT
Status: Offline
Points: 2684
Post Options Post Options   Thanks (0) Thanks(0)   Quote New2brass Quote  Post ReplyReply Direct Link To This Post Posted: Jul 06 2020 at 12:04pm
Wayne, that was the highest number on the 100 receivers Underwood received and renumbered from Inland.
ccnl 259-3

I somehow thought Charlie was saying round vs sq. cut making me think Inland.

I need caffeine Pinch 

Too add: Underwood produced the first block then worked on the the 4 million block. Before finishing the 4 million block they moved onto the 2 million block (Underwood and subcontract) then working in the 6 million and finishing the 4 million block.

Does this makes things easy?

the additional notch was a tooling hole to get the cutting bit in and out. It made manufacturing easier. I guess NPM never got the memo.

The wider width saved time and tooling wear. 



Edited by New2brass - Jul 06 2020 at 12:45pm
Back to Top
 Post Reply Post Reply

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.01
Copyright ©2001-2018 Web Wiz Ltd.

This page was generated in 0.094 seconds.