One site I use is Orange Mod Works. also if you follow them on facebook, twitter and subscribe on youtube you have a chance to win a free kit from them. As far as springs go, best place I have found. Springs are made to the size of each gun. perfect fit when you buy. Prices are nice also. and for brass tubing, talk to a music shop or instrument repair shop. Hince one section of instruments is called brass, they should have some if talk nicely or be able to point in the direction of where you get it.
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