If you plan on using a M120 spring in your gun make sure that you buy the appropriate rubber and bucking for your hop up.....preferably a hard one because a soft one will wear down faster and might not give you the accuracy that a hard one will.
These are the two that I am currently using and work well in my set up;
Mad Bull 60 Degree Shark Bucking Hop-Up Rubber Set
Prometheus Air Seal Chamber Packing (Hard Type)
Cheers
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They can have my rifle when they can pry it from my dead cold fingers
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