Broken Mainspring On Bolt

[neos]

Hi all. So, I was just working on a bolt for a friend and the mainspring was very weak. So as I attempted to stretch it, it fell apart as it was very rusty. Anyways, I was wondering if there is anywhere a person could go buy a spring to use (Canadian Tire, Home Depot, etc), or would this be a specific spring. The best I know of is that the spring inner diameter is 5/16", and the spring material itself is about 1/16". About 2" long. Thank you.

 

[tiriaq]

Make and model of gun?
I have odds and ends of springs, but more information would help.
ID, OD length, compression?

 

[neos]

Mossberg Model 40
ID - 5/16 (.3125)
OD - 7/17 (.4375)
Length - Was compressed and weak when I got it, but would say 1 1/4 - 1 1/2"
Compression spring, yes. (If this is what you were asking)

Thank you.

 

[Hitzy]

Compression lbs would be the question.

 

[mr.e moose]

One of the best buys out there is go to Princess auto and brows the surplus section. They used to have a bag of 100 assorted springs for under $10.00.

 

[neos]

Compression lbs would be the question.

How would one determine the compression lbs if the original is broken, missing, or compressed?

 

[flyr]

https://www.gunpartscorp.com/products/751410A[/url]
Not in stock...sorry

 

[fingers284]

How would one determine the compression lbs if the original is broken, missing, or compressed?

if it doesn't take a come-along to close the bolt(#### the gun) and it fires primers "every time" then I would consider it "within spec."

 

[neos]

Well, finger crossed, music wire spring is now in tempering mode in the oven. Should know more tomorrow if this works.