I was thrilled when my 365XL was delivered. Upon examination, it seemed the slide was stuck or broken. I checked videos on You Tube, apparently the XL slide and the regular 365 slide operate differently, even though theyre almost the same firearm. I contacted Sig Sauer and was informed, this is the way the XL is designed and after considerable use the slide will loosen up. Even the reviewer had a considerable problem pulling back the slide, stating he had to use all his strength to move the slide. I guess my trips to the Gym have payed off, with considerable effort, I managed to pull back the slide. Sig Sauer informed me if the slide didnt loosen up after some use, I was to return the weapon to them for investigation. OK, will do!