Please try a search. The topic has been discussed a lot in the past.
Also there is an article in the Gunsmithing section of the articles part of the web site. http://www.savageshooters.com/conten...Bolt-Lift-Kits
The bottom line is that a bolt lift kit is an attempt to reduce some of the friction forces that are part of the reason that Savage bolts can be hard to cycle.
They help somewhat, but are not a be all and end all for there are other forces that must be overcome to reduce the force needed to cycle the bolt.
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