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I have around 850 rounds through my 40 Compact and I'm beginning to think that I should get a recoil spring replacement before long... anyone have any idea of the lifespan of a 40C recoil spring? What are the best sources for recoil spring replacements? Thanks, in advance... DHart
 

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Unless you are having problems, I would wait until you have about 5000 rounds before changing the recoil guide rod assy. I bought my replacement from S&W.
 

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I have a full size - had 2 failure to load problems at around 1,500 rounds- the slide was not closing - had to bump it for the last 1/2 inch - I called and ordered 3 recoil rod/springs.



They were on back order for a few months - I finally called and got them to ship me one.



I tested both new and old springs - old spring tested 14.5 pounds - new spring was 16 pounds.



I have not had any issues since replacement. I plan to test the strength every 500 or so rounds - just to see if it changes. I do not know if the original spring was weak to start with - or wore out quickly. A new one is $7.00 -



I made my own spring weight test machine - it is very crude - but works - I need a better scale.



I took an piece of 2x2 that was left over from a project about 12 inches long (a 4x4 would also work)



Took a drill bit that was slightly larger that the end of the recoil rod and drilled a hole all the way through the 2x2.



Next took a drill bit slightly larger that the diameter of the recoil spring and drilled it about 3/4 the way through the 2x2 in the same place as the first hole.



Then I took a scale (I used our bathroom scale)



Put another scrap piece of wood on it - and set the scale to zero



Then stuck the recoil rod into the hole I drilled - and pressed it against the wood on the scale - using the board with the hole drilled to force the spring to compress.



I must have too much time on my hands.
 

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are the recoil rod/spring assemblies the same for the compact as they are for the full-size? I don't have a full-size, so I can't exactly whip one out for comparison.
 
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