The Springco White is a great spring and is better than a normal carbine spring and here is why:
It is more linear and it functions more like a rifle spring.
If you count the coils and measure OAL, it's easy to see that they are different from a normal carbine spring.
I'm a huge fan of Springco and have had no issues using them in a wide variety of guns. They have a full molydisulfide coating and are not affected by salt spray and corrosion in the way that naked CS can be.
I would recommend a Springco White and an H2 buffer for your M400.
"That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892
"The body cannot go where the mind has not already been."
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