Hey matey, take off the grip frame and find out exactly where the leak is coming from; either the solenoid of manifold - if it's coming from the 'noid then it's feckered, if it's coming from the manifold then check the o-rings.
Also, check the o-rings on the bolt itself, this includes the inner ones as well. (check the o-ring on the front of the bolt guide and the first two on the firing can). If those are fine then give your bolt a good lubing.