If you want only ok ranges with an easy pull go for a NF/LS spring combo, if you want high range but would be harder to pull but not extemly hard to pull go for a BBB/LS spring combo and if you want some ridicoulous power go for NF/LS/BBB combo. If you do the last 2 options I would highly suggest metal plating the bolt sled because it will crack eventually anyway. Also the NF/BBB/LS spring combo is a real bitch to pull.
Are there any other good springs too use, and is it a good idea to add an o-ring?
sry i ask so many questions lol
We have no sig.