Not that I've seen. Well, I've looked at in stock ones in the rating that I want and they're all 172mm! Happy to be proven wrong though.
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DanBow
Lozart
Not guesswork as such, more that the length of the spring is a function of the material, thickness, coil density and heat treatment.
In theory, two M110 springs can be completely different lengths but still have the same result in the gun. One of the big differences is that OEM springs tend to be cheaper, linear and not so likely to last for long whereas aftermarket ones are often made from better materials, have progressive windings etc (so cost a bit more). Quite often in my experience at least, the OEM springs are thicker, linear and made of some kind of weird alloy of steel and brie that loses its strength quite quickly but is often shorter because they're made from thicker metal than an equivalent aftermarket one made of finest Japanese tool steel.
Unless your new spring is SOOOOO much longer that you're effectively preloading it too much by compressing it into your gun, I really wouldn't sweat it. None of the manufacturers seem to be able to actually make springs that are consistent between each other, even at the same ratings. Find one that works for you and stick with it.
In theory, two M110 springs can be completely different lengths but still have the same result in the gun. One of the big differences is that OEM springs tend to be cheaper, linear and not so likely to last for long whereas aftermarket ones are often made from better materials, have progressive windings etc (so cost a bit more). Quite often in my experience at least, the OEM springs are thicker, linear and made of some kind of weird alloy of steel and brie that loses its strength quite quickly but is often shorter because they're made from thicker metal than an equivalent aftermarket one made of finest Japanese tool steel.
Unless your new spring is SOOOOO much longer that you're effectively preloading it too much by compressing it into your gun, I really wouldn't sweat it. None of the manufacturers seem to be able to actually make springs that are consistent between each other, even at the same ratings. Find one that works for you and stick with it.
strykerles
Acquired from joblots, boneyard guns and some replacements. The shorter ones tend to give "hot" results on a chrono strangely enough
View attachment 128093
View attachment 128093
Colin Allen
I agree with Lozart; the XT springs seem to be far more consistent within each power rating than any others that I have tried.
ak2m4
Thanks Colin, means a huge amount when I hear stuff like that and spurs me on.
gavinkempsell
Just a though but do you have a boneyard/display only pew that you could take the spring from?
Lozart
This is (top to bottom) a 400FPS Specna OEM spring, an Ultimate M100 spring and an XT M95 spring. The length. Doesn't. Matter.
View attachment 128231
View attachment 128231
Colin Allen
What is an AK Spring?
DanBow
@strykerles no idea, when i saw it was shorter i just put it back in! Its a quick change so I'll whip it out and check when I'm not working.
Colin Allen
a spring out of an AK, obvs
I was unaware that there are specific AK springs. Does that mean I need to buy a new AK every time I want to change the spring in an existing one? That would lead to me either having a lot of springless AKs or buying an infinite number of AKs.
I was unaware that there are specific AK springs. Does that mean I need to buy a new AK every time I want to change the spring in an existing one? That would lead to me either having a lot of springless AKs or buying an infinite number of AKs.
Colin Allen
Shall we bring Guarder spring ratings into the conversation, just to really cause confusion?
