2ndArmored Posted December 5, 2016 Report Share Posted December 5, 2016 I'd like to know what the spring constant is for the 30-rd box. I can't find it in my search of the internet nor my Thompson "library". I can improvise an inelegant measuring contraption, but thought it might be better to have the actual number, especially if anyone's already got the original specs somewhere. May the Force be with you. Link to comment Share on other sites More sharing options...
reconbob Posted December 5, 2016 Report Share Posted December 5, 2016 Not sure what your definition of spring constant is but if yougo to NFAtoys.com you can see/download the drawing whichhas the load compressed and Un-compressed. Bob Link to comment Share on other sites More sharing options...
giantpanda4 Posted December 5, 2016 Report Share Posted December 5, 2016 Force divided by distance... Link to comment Share on other sites More sharing options...
2ndArmored Posted December 6, 2016 Author Report Share Posted December 6, 2016 Not sure what your definition of spring constant is but if yougo to NFAtoys.com you can see/download the drawing whichhas the load compressed and Un-compressed. BobFound it - thanks! Link to comment Share on other sites More sharing options...
anjong-ni Posted December 11, 2016 Report Share Posted December 11, 2016 https://www.gunsprings.com/Rifles%20&%20Shotguns/THOMPSON/Magazine%20Springs/cID2/mID115/dID350 If it's about a gun-spring, Wolff might know. I get mine from them....Phil Link to comment Share on other sites More sharing options...
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