cleaning...
If it feels slugish-sticky, what I do first is put on some rubber gloves, take off the grips, and run some non residue brake parts cleaner through it, with the red tube stuck into anywhere it will go-hammer and trigger, cocked and un cocked. Keep revolving the gun around and work the action a bit in between sprays. Turn it all around to let it drain, and set it aside to dry. I leave it alone overnight. Then check the action, there should be a felt difference if it was gunked up. Add a small ammount of lube. If this doesen't do it, you can repeat, or proceed with more invasive measures. I have had dramatically positive results with this simple procedure. Flapjack.