Theres a couple things I would do first.I would tap out the pin on the mag tube and disassemble the inner tube and clean it with solvent and run a bore brush down the tube and lube it with some Remoil or similar lube.Steel wool the outside of the mag tube with some oil or solvent to remove any grime or build up.Then clean the outer mag tube with a bore brush and lube.See where your at after this,then either streach the spring or replace it.I would clean your entire gun at the same time.Hope this helps. :grin: