Hello: Took my P1 out to the range this weekend to finally test fire it.  Had a problem- the slide did not always return to battery after it was fired(on recoil) so needless to say, only put a few rounds through it.  When I took it home I F/S'd and everything looks good.  What could it be, is it something I can fix or should I take it to the smithy?  Thanks in advance, john

To be exact:
You fired the gun and the slide failed to close completely? (Slide ALMOST closed but not quite).

OR, the round failed to feed into the chamber all the way? (Round caught between the slide with the bullet nose pointing up into the roof of the chamber).

Things to do.
1. Try a different brand/type of ammo.  Some guns just don't "like" all ammo.  These guns were designed to fire round nosed, full metal jacketed, 125 grain ammo.
2. Try a different magazine.
3. CLEAN and lube both the gun and magazine.  Some of these guns have sat in armories for 30 to 40 years and the lube has dried out or gummed up.
4. Possibly the gun just hasn't been broken in yet.
5. Well used gun?  Possibly weak recoil springs.

You were not using Blazer ammo by chance were you?  

No, I was using American Eagle 115 Grn. FMJ.  It was feeding fine, just the slide wasn't going back to lock up after it had fired.  You could actually push the slide forward and then it would lock up.  It didn't do it on every single round fired but about half.  Thanks for helping me out.  john

Sounds like a good cleaning & oiling would solve the problem, IMO. Personally, I don't believe there's such a thing as "too much oil". The excess will always shake off from the recoil.

Thanks for the good info.  Sorry I didn't respond quicker, been out doing pistol and rifle training for the last 4 days.  Thanks again, John