I researched across interweb for the data on various buffer spring in their respective receiver extensions and I found shockingly that not one forum have pinned thread with all springs' s specs. There's shockingly lack of data on this subject overall and I set out to change that with help of m4c community.
I attempted to find all information I seek myself by using limited data I found and math gymnastics. I come to those numbers below which I doubt all are accurate within half pound. I would like for owners of those system to confirm if those data are accurate within half of pound or correct me please. You can find out easily by compressing your spring and buffer until its lick under the length of respective appropriate buffer tube that it goes in on scale calibrated for the weight of clear tube or pvc plus spring and buffer and note the weight. After finding preload that was you then fully compress it until buffer bottom out if your scale can handle it and note the weight. If your scale cant handle the weight then you could even work around the issue by tying say 15LB dumbell to charging handle in manner dumbell would be dangling vertically able to stand on its bottom if landed on flat surface. You then slowly place dumbell upright on ground and lift rifle muzzle up and slowly land put dangling dumbell on scale until the bcg start move forward and note the weight. Then subtract the scale reading with actual weight of 15LB dumbbell which might not be 15LB. Or stand on different scale weighting yourself and have somebody bottom out the buffer on scale that you are standing on then subtract the result with your weight.
(For the rifle spring in A5 I did some failed spring engineering calculation and using believed to be botched result which I keep doubting so I average it with basic parabola of rifle spring in rifle tube using three known points of relaxed length at 12.75 inch and zero force then 10inch with 5.61lb of force then roughly 4.8inch with force of 10.9LB )
I do not have anything but carbine tube, red springco, and carbine spring.
Original rifle spring in rifle tube
5.61 LB preload - 10.9 LB buffer bottom out
Original rifle spring in A5 tube
7.84 LB preload - 10.9 LB buffer bottom out
It just might be close to 7.21LB if spring calculation I did was right.
Green springco in A5 tube
Unknown but wild estimate is
8.5LB preload - 11LB buffer bottom out
Red springco in carbine tube after about 5k round
8.31LB preload - 11.22LB buffer bottom out
Original carbine spring in carbine tube
6.3LB preload - 11LB buffer bottom out
This information would not be only useful for me but others looking into getting springco green to replace their rifle spring or red springco to replace their original carbine spring or even other spring that somebody may post data for.
Other data for springco colors such as blue, white, etc. Is of course welcomed too. Other data for spring such as some flatwire springs or other high quality buffer spring will also be highly appreciated by rest of forum and me.
Please continue to find and post your data desipte that you may see such data already exist ITT your data will give more accurate averaging and reinforce our finding. Please include round count for the spring data and say whats error margin for the round count of spring. Error margin from few hundred to thousand is much better than completely unknown.


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