Hi Roland and welcome. No, the Glock 17L is not meant to replace the Glock 34, as they are both competition pistols with slightly different features and purposes, with the 34 being a shorter, more balanced option while the 17L has a longer slide and barrel for increased accuracy and sight radius. The only notable difference is the 17L barrel and slide are longer and squared in the front. The 34 slide nose has side bevels. Cheers and stay safe!

No it is not meant to replace the 34 its just another option available