I just purchased a new Walther PPS-M2 and have a question regarding reassembly of the gun after cleaning. I've seen many videos on YouTube and I see differing instructions regarding reassembling the slide. Some videos simply guide the slide back onto the rails and rack it back into position. Some videos say you must pull the trigger forward before reinstalling the slide, and other videos say you need to pull the trigger before reinstalling the slide. Not wanting to cause damage to my new gun, is there someone who owns a PPS-M2 who can give me the correct method for reinstalling the slide?