Go Back   CMP Forums > CMP Sales > M1A/M14
Register FAQ Members List Calendar Mark Forums Read

Reply
 
Thread Tools Display Modes
  #1  
Old 01-03-2021, 01:50 AM
lennnorment lennnorment is offline
 
Join Date: Oct 2009
Location: North Carolina
Posts: 1,257
Default Demilled recievers

I saw some back halves of M14s at a local show recently. They were from real M14 rifles and not from some commercial rifles. They had been shear cut just forward of the rear sight base. Other than a paper weight, what would these possibly be good for?

Last edited by lennnorment; 01-03-2021 at 02:01 AM.
Reply With Quote
  #2  
Old 01-03-2021, 04:47 AM
1563621 1563621 is offline
 
Join Date: Oct 2009
Location: NJ
Posts: 3,071
Default

I know many years ago there were rewelds of these. I think they had a license to do it. Now , no, really just a item to place on shelf for memories, Good & Bad!
Reply With Quote
  #3  
Old 01-03-2021, 06:01 AM
nf1e nf1e is offline
 
Join Date: Apr 2012
Location: Connecticut
Posts: 2,632
Default

Paper weights is about the best idea for them.
__________________
Semper Fi
Art
Sgt USMC 66 -72
RVN 67-68
Reply With Quote
  #4  
Old 01-03-2021, 06:24 AM
TLB TLB is offline
 
Join Date: Jul 2010
Location: Ohio
Posts: 2,406
Default

At one show a few years ago, someone had cut off heals behind the sight ears and mounted one of each manufacturer at the quarter hour, making a custom clock.
__________________
Current Feedback:
Former iTrader Feedback: 41 with 100% positive transactions
Reply With Quote
  #5  
Old 01-03-2021, 08:30 AM
Random Guy Random Guy is offline
 
Join Date: May 2011
Location: Northern Virginia
Posts: 1,815
Default

I have 4 heels, one from each manufacturer. I wish James River Armory was still offering to make civilian receivers out of them (ATF-complaint) - but they quit doing that a couple of years ago, so my de-milled heels are just sitting on a shelf gathering dust....

Last edited by Random Guy; 01-05-2021 at 12:57 PM.
Reply With Quote
  #6  
Old 01-03-2021, 03:53 PM
Ted Brown Ted Brown is offline
 
Join Date: Nov 2012
Location: Jacksonville, OR
Posts: 635
Default

I have several receiver demills. I use them as a reference when checking tolerances on commercial receivers.
Reply With Quote
  #7  
Old 01-03-2021, 05:03 PM
rickgman rickgman is offline
 
Join Date: Oct 2009
Location: Michigan
Posts: 1,184
Default

Quote:
Originally Posted by Ted Brown View Post
I have several receiver demills. I use them as a reference when checking tolerances on commercial receivers.
Ted, I would be concerned that the huge mechanical stresses imparted on the receiver when it was sheared in two would deform the remaining piece to the point where it would not be useful as a reliable reference for dimensions. A part print would be far more reliable and would also give the tolerance range - not just the dimension of the speciic part in your possession.
Reply With Quote
  #8  
Old 01-04-2021, 10:01 AM
ZvenoMan ZvenoMan is offline
 
Join Date: May 2011
Location: AL
Posts: 4,242
Default

Quote:
Originally Posted by rickgman View Post
Ted, I would be concerned that the huge mechanical stresses imparted on the receiver when it was sheared in two would deform the remaining piece to the point where it would not be useful as a reliable reference for dimensions. A part print would be far more reliable and would also give the tolerance range - not just the dimension of the speciic part in your possession.
Can't argue the value of a print but sometimes a 3D reference is best.
If you verify whatever dimensions you are using on the demilled part it doesn't matter what stresses it suffered.
Kind of like a go-no go gauge. It doesn't matter what it is or how it was made, if the key dimension is accurate (and it's a suitable material) then it works for that purpose.
In the warbird restoration field recovered wrecks are disassembled and many parts, clearly not airworthy are used in the same manner.

Again like the warbird field, demilled receivers have a value to some people simply because of what they were and where they may have been.

JH
__________________
Zvenoman

Zvenoman's Feedback Thread
Reply With Quote
  #9  
Old 01-04-2021, 07:41 PM
rickgman rickgman is offline
 
Join Date: Oct 2009
Location: Michigan
Posts: 1,184
Default

Quote:
Originally Posted by ZvenoMan View Post
Can't argue the value of a print but sometimes a 3D reference is best.
If you verify whatever dimensions you are using on the demilled part it doesn't matter what stresses it suffered.
Kind of like a go-no go gauge. It doesn't matter what it is or how it was made, if the key dimension is accurate (and it's a suitable material) then it works for that purpose.
In the warbird restoration field recovered wrecks are disassembled and many parts, clearly not airworthy are used in the same manner.

Again like the warbird field, demilled receivers have a value to some people simply because of what they were and where they may have been.

JH
Well, folks can do as they see fit but a part (assuming it is within spec) has very limited value as a dimensional model. It isn't like a go / no go gage. It only represents one set of dimensions. Part prints on the other hand represent the target dimensions, the tolerances with respecty to those dimensions and clearly define what are critical dimensions and what are reference dimensions.

Call me old fashioned but with over 4 decades of experience as a graduate mechanical engineer, my primary source of dimensional information is still part prints. Everything else is either a secondary or tertiary source.
Reply With Quote
  #10  
Old 01-05-2021, 12:30 PM
ZvenoMan ZvenoMan is offline
 
Join Date: May 2011
Location: AL
Posts: 4,242
Default

Quote:
Originally Posted by rickgman View Post
Well, folks can do as they see fit but a part (assuming it is within spec) has very limited value as a dimensional model. It isn't like a go / no go gage. It only represents one set of dimensions. Part prints on the other hand represent the target dimensions, the tolerances with respecty to those dimensions and clearly define what are critical dimensions and what are reference dimensions.

Call me old fashioned but with over 4 decades of experience as a graduate mechanical engineer, my primary source of dimensional information is still part prints. Everything else is either a secondary or tertiary source.
You missed the key point: "Limited Value"
If you need to physically check one (or several) dimensions in a limited production setting then demilled parts, after proper measurement and testing, as well as new parts that failed QC in some other area are often (by no means always) perfect.
No one is implying a demilled part is somehow more accurate or better than a print, nor would anyone use them for primary information, but considering their cost and durability they are often perfect for some "limited" uses.
This is exactly what has been suggested my myself and others in this thread.

JH
__________________
Zvenoman

Zvenoman's Feedback Thread
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 10:53 PM.