Enfield-Rifles.com Homepage
Forum Home Forum Home > Enfields > 7.62 Enfield
  New Posts New Posts RSS Feed - No. 4 Conversion to 7.62
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

No. 4 Conversion to 7.62
 Post Reply Post Reply Page  <123
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
Goosic View Drop Down
Senior Member
Senior Member
Avatar

Joined: September 12 2017
Location: Phoenix Arizona
Status: Offline
Points: 8842 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: December 17 2022 at 4:31pm
I used a Dremel Tool with a cutoff wheel for the course work and then cleaned it up with a file when I did the down and dirty trick...
Back to Top
Goosic View Drop Down
Senior Member
Senior Member
Avatar

Joined: September 12 2017
Location: Phoenix Arizona
Status: Offline
Points: 8842 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: December 17 2022 at 4:49pm
lawndart: I found one of my spare 2A1 barrels. The following photos show a standard No4Mk1 barrel on the left and a 2A1 Ishapore barrel on the right. Measurements may vary but on my particular No4 barrel from the breech face back to the shoulder measures 0.695" and that is what I cut the 2A1 to and that got me with the proper indexing and lock up when tightening the barrel to the No4Mk1 reciever...
Back to Top
lawndart View Drop Down
Groupie
Groupie


Joined: December 07 2022
Location: Boston, MA
Status: Offline
Points: 68 		Post Options Post Options   Thanks (0) Thanks(0)   Quote lawndart Quote  Post ReplyReply Direct Link To This Post Posted: December 18 2022 at 9:24am
Originally posted by Goosic Goosic wrote:

I used a Dremel Tool with a cutoff wheel for the course work and then cleaned it up with a file when I did the down and dirty trick...

Damn, that take a lot of skill... 
Back to Top
lawndart View Drop Down
Groupie
Groupie


Joined: December 07 2022
Location: Boston, MA
Status: Offline
Points: 68 		Post Options Post Options   Thanks (0) Thanks(0)   Quote lawndart Quote  Post ReplyReply Direct Link To This Post Posted: December 18 2022 at 9:25am
Originally posted by Goosic Goosic wrote:

lawndart: I found one of my spare 2A1 barrels. The following photos show a standard No4Mk1 barrel on the left and a 2A1 Ishapore barrel on the right. Measurements may vary but on my particular barrel from the breech face back to the shoulder measures 0.695" and that is what I cut the 2A1 to and that got me with the proper indexing and lock up when tightening the barrel to the No4Mk1 reciever...

This is awesome, thanks. This picture also does a great job of showing how much lighter that 2A1 barrel is...
Back to Top
Goosic View Drop Down
Senior Member
Senior Member
Avatar

Joined: September 12 2017
Location: Phoenix Arizona
Status: Offline
Points: 8842 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: December 18 2022 at 10:01am
There is a company in Texas that sells a 45ACP conversion kit for the No4Mk1 and it is a straightforward installation process.  I had one but it just was not my cup of meat. IIRC, the company is Rhineland Arms...
Back to Top
Zed View Drop Down
Special Member
Special Member
Avatar
Donating Member

Joined: May 01 2012
Location: France
Status: Offline
Points: 6460 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Zed Quote  Post ReplyReply Direct Link To This Post Posted: December 18 2022 at 10:14am
Originally posted by Goosic Goosic wrote:

I used a Dremel Tool with a cutoff wheel for the course work and then cleaned it up with a file when I did the down and dirty trick...

What did you modify with the Dremel and file? Did the extractor slot require modification after indexing the barrel? 
I assume you lathe turned the shoulder of the 7.62 barrel to clock the extractor slot the 180° required for the no4 receiver.

Apologies if this is a dumb question; but I don't get what the "down and drity trick" is!
It's nice to be important, but it's more important to be nice!
Back to Top
Goosic View Drop Down
Senior Member
Senior Member
Avatar

Joined: September 12 2017
Location: Phoenix Arizona
Status: Offline
Points: 8842 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: December 18 2022 at 11:05am
Originally posted by Zed Zed wrote:

Originally posted by Goosic Goosic wrote:

I used a Dremel Tool with a cutoff wheel for the course work and then cleaned it up with a file when I did the down and dirty trick...

What did you modify with the Dremel and file? Did the extractor slot require modification after indexing the barrel? 
I assume you lathe turned the shoulder of the 7.62 barrel to clock the extractor slot the 180° required for the no4 receiver.

Apologies if this is a dumb question; but I don't get what the "down and drity trick" is!
The down and dirty or backyard gum smiff way is to just screw the No1Mk111 or 2A1 barrel to the No4 reciever and then mark the location of where the new extractor cut will be. When you are done you end up with a barrel that has two extractor cuts. One original and one not...
Back to Top
lawndart View Drop Down
Groupie
Groupie


Joined: December 07 2022
Location: Boston, MA
Status: Offline
Points: 68 		Post Options Post Options   Thanks (0) Thanks(0)   Quote lawndart Quote  Post ReplyReply Direct Link To This Post Posted: December 18 2022 at 11:53am
Originally posted by Goosic Goosic wrote:

There is a company in Texas that sells a 45ACP conversion kit for the No4Mk1 and it is a straightforward installation process.  I had one but it just was not my cup of meat. IIRC, the company is Rhineland Arms...

I had one of those 45 ACP conversions for a while, but it was from the now-defunct Special Interest Arms.

I reached out to Rhineland though, and he told me he'd sell me barrel nuts if I go with a barrel nut rather than a shoulder.
Back to Top
Goosic View Drop Down
Senior Member
Senior Member
Avatar

Joined: September 12 2017
Location: Phoenix Arizona
Status: Offline
Points: 8842 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: December 18 2022 at 12:40pm
That is what I had which made the installation a snap...
Back to Top
lawndart View Drop Down
Groupie
Groupie


Joined: December 07 2022
Location: Boston, MA
Status: Offline
Points: 68 		Post Options Post Options   Thanks (0) Thanks(0)   Quote lawndart Quote  Post ReplyReply Direct Link To This Post Posted: December 19 2022 at 9:19am
Originally posted by Goosic Goosic wrote:

That is what I had which made the installation a snap...

I just reached out to Shaw Custom barrels to see if they'd do a Savage-style tenon but in 1" x 14 tpi Whitworth instead of the 1-1/16" x 20 tpi. If not, I can order it unthreaded and try to get that done locally. it doesn't seem like an overly exotic thread spec.

Lawndart
Back to Top
lawndart View Drop Down
Groupie
Groupie


Joined: December 07 2022
Location: Boston, MA
Status: Offline
Points: 68 		Post Options Post Options   Thanks (0) Thanks(0)   Quote lawndart Quote  Post ReplyReply Direct Link To This Post Posted: December 19 2022 at 12:19pm
Shaw replied and said they won't do that tenon.

Could I run a tap through the receiver to convert the threads from Whitworth form to standard 60-degree V form?

Lawndart
Back to Top
Goosic View Drop Down
Senior Member
Senior Member
Avatar

Joined: September 12 2017
Location: Phoenix Arizona
Status: Offline
Points: 8842 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: December 19 2022 at 12:29pm
I have never attempted it but, that is not to say that it cannot be done...
Back to Top
lawndart View Drop Down
Groupie
Groupie


Joined: December 07 2022
Location: Boston, MA
Status: Offline
Points: 68 		Post Options Post Options   Thanks (0) Thanks(0)   Quote lawndart Quote  Post ReplyReply Direct Link To This Post Posted: December 19 2022 at 12:30pm
Originally posted by Goosic Goosic wrote:

I have never attempted it but, that is not to say that it cannot be done...

Thanks, I'll post on some of the machining forums in the meantime. I bet there's some knowledge out there on thread forms.
Back to Top
Goosic View Drop Down
Senior Member
Senior Member
Avatar

Joined: September 12 2017
Location: Phoenix Arizona
Status: Offline
Points: 8842 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: December 19 2022 at 12:47pm
May inquire as to why the opposition to keeping the original threads? 
Back to Top
lawndart View Drop Down
Groupie
Groupie


Joined: December 07 2022
Location: Boston, MA
Status: Offline
Points: 68 		Post Options Post Options   Thanks (0) Thanks(0)   Quote lawndart Quote  Post ReplyReply Direct Link To This Post Posted: December 19 2022 at 1:00pm
Originally posted by Goosic Goosic wrote:

May inquire as to why the opposition to keeping the original threads? 

The cheaper custom barrel makers I'm talking to aren't used to cutting other forms. I'd prefer to keep the original form if I could get that from a barrel maker that would turn a barrel for a reasonable price. Otherwise, I'm open to chasing the threads if that would work and give me options.

For example, I could do Shaw Custom for a hair under $200, or McGowen for a bit under $300.

Lawndart
Back to Top
lawndart View Drop Down
Groupie
Groupie


Joined: December 07 2022
Location: Boston, MA
Status: Offline
Points: 68 		Post Options Post Options   Thanks (0) Thanks(0)   Quote lawndart Quote  Post ReplyReply Direct Link To This Post Posted: December 19 2022 at 3:13pm
For posterity's sake, McGowen told me that they always cut 60-degree V-form threads for these and that it doesn't cause issues due to the tolerances in the thread spec. If it's too tight though, I'll just chase the threads like I said.

Lawndart
Back to Top
 Post Reply Post Reply Page  <123

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.07
Copyright ©2001-2024 Web Wiz Ltd.