in the picture you can see that they are just a bit different than the original springs that came in the kit.
these are a new ratio that was figured out by Mike@Prexis/Sten. He was willing to share this info and now im passing it on & making it available to anyone else who wants them at just enough cost to mail them to you.
This is not a perfect science and there are no guarantee's!! but for this price, you cant go wrong.
im doing this 2 ways.
the spring actually comes in 12" lengths closed on both ends, you will have to cut 1 of them off to get the length. This gives you 1 closed end & 1 open end. You decide which end you want to go either way.
option #1: you get 2 springs and you pick your length and go at it.
option #2: you get 2 springs and they will be cut to the length in the pictures below.
The original SAS springs are pitcured on the top,the new ones are on bottom.

ive only ran about 50 rounds thru with them tonite, they worked better than the originals.(to me) Good cocking feel and plenty of striker force. recoil felt the same.
MJ has never given me bad info and for $5 delivered per set.... thats way cheaper than just 1 spring at most places. (if anyone would give you a straight answer on what you need)
lets make this clear: im making nothing on this, just wanted some spares and to make them available for people who love the "ugly little tube gun".
since there is no profit in this, im offering these as is!! no warranty,no promises,no refunds. what do you expect for $5?
if you have a question pm me and will do my best to answer it.
pm for payment info also.
thanks
sdk1968