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Hi all I brought a standard m4 with full metel case I have just had it upgraded I have a guarder sp100 spring upgrades piston full metel teeth vented cylinder head twin o ring new up rated spring guide and I have fitted a set of deans connectors I must say I got it at 347 fps and its as smooth as James Bond when fired it is a total joy when you finally get your rifle handling the way you want all I need now is a tight boar barrel I ain't going to run on lippo as this just kills your gearbox.


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