M1 Garand Operating Rod spring. Manufactured and designed to USGI Specification in the USA.
M1 Garand Operating Rod Spring
$7.75
Available!
We are pleased to be able to offer for sale a newly manufactured USGI spec operating rod spring. Our springs are manufactured in the USA using 17-7 stainless steel wire (ASTM A313) on state of the art CNC spring winding machines. After being formed our springs then undergo a heat treatment process which sets the springs to condition CH-900. This extra step (that many manufacturers skip) increases the ultimate tensile strength of the spring by over 21%. The heat treatment process also increases the yield strength of the spring by over 37%.
Spring Material Terminology
- Ultimate tensile strength here refers to the spring wires ability to resist being pulled or stretched apart.
- Yield strength is defined as the stress at which a material begins to deform plastically and will not return to its original form.
USGI SpecificationsQ: What does USGI Spec mean? A: The army set forth certain parameters that an operating rod spring must meet. This specification is defined in drawing #6147568. These specification include things like wire diameter, outside diameter, maximum solid height, etc. The two most important parameters have to do with the spring rate. When the spring is loaded with a certain fixed weight (force) the spring must compress a certain distance. The specification states that when an operating rod spring is compressed with a 5lb weight the spring must compress to a length of between ( 16.75″ and 17.75″ ). When an operating rod spring is compressed with a 16lb weight the spring must compress to a length of between ( 11.75″ and 12.75″ ).
Our M1 Garand operating rod spring has the following parameters:
- A 5lb weight compresses our spring to 17.1″
- A 16lb weight compresses our spring to 12.2″
(Click Graph to enlarge)
If your operating rod spring is too strong or too weak then the rifle will have stoppages and other failures. The majority of problems that new shooters have with the M1 Garand can be traced to the operating rod spring. Replacing your 50+ year old spring is good insurance against malfunctions.
Our operating rod spring comes with a lifetime warranty. If you ever wear out or break our spring from normal use contact us and we’ll send you a new spring. Made in the USA
| Weight | 0.125 lbs |
|---|---|
| Dimensions | 4 × 4 × .3 in |
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Mark –
Failure to cycle – fixed with new op-spring
I just wanted to thank you for the great resource your website is! I had purchased my second M1 Garand from the CMP (CMP Special – WRA receiver, new criterion barrel and new walnut stock). Spent considerable time finishing the stock (BLO – 10 coats) and when I finally was able to shoot her – I got intermittent cycling which eventually turned to no cycling – having to retract the bolt to fire each round. Your article on “Failure to Cycle” was extremely helpful and I ordered new op-springs. I changed out the op-spring this morning – lubricated it well and went to the range. Problem solved! Thank you sir!
Mike –
fixed the issue
Ordered three of these for aging VFW post weapons that were not feeding correctly. Solved the problem big time. Good company to to business with. Right product and fast shipping.
2sheds –
Top quality
An easy replacement of a crucial part. High quality and excellent service with fast turn-around. I wish they had more stuff as it would be my source of preference.
AFJuvat –
Painless replacement.
Ordered this to replace the spring that came with my CMP special grade. Correct size and tension.
Terry –
Quality Spring.
What can you say about a spring. It just works.
Eric Thomsen –
Rifle functions flawlessly now. Good product.
Installed one of these on my Winchester and it was easier than I thought it would be. Don’t forget that the spring needs to be greased before installation. Rifle functions flawlessly now. Good product.
Oscar Andrew –
nice replacement
thank you, nice replacement for the old spring that had signs of chaffing and binding
Joseph MacGillivray –
Took the Garand out shooting today and it performed like a dream
My M1 from CMP was having a hard time chambering the first round. After a detail strip I found the Op spring had broken. Ordered one of these and it arrived with in 2 days. Took the Garand out shooting today and it performed like a dream. No problems loading, chambering or firing. Highly recommend!! Plus what a great web site! Thanks for the good service… will be using this site for future buys.