I would recommend reaching out to Urban Carry Holsters directly for a more specific size chart. The size chart provided by Urban Carry is listed below:
G3 Specifications:
Cadet (Most Small Pocket Pistols)
Overall Flat Size: 11.75” x 5” x 0.25"
Size Folded Worn: 8.5” x 5” x 1"
Weight: Apx. 7.6oz
Material: Saddle Grade Leather
Trooper (Most Small Sub-Compacts)
Overall Flat Size: 12.75” x 5.25” x 0.25"
Size Folded Worn: 9” x 5.25” x 1"
Weight: Apx. 7.9oz
Material: Saddle Grade Leather
Lieutenant (Most Sub-Compacts)
Overall Flat Size: 13” x 5.75” x 0.25"
Size Folded Worn: 9.5” x 5.75” x 1"
Weight: Apx. 8.1oz
Material: Saddle Grade Leather
Captain (Most Compacts)
Overall Flat Size: 14.25” x 6” x 0.25"
Size Folded Worn: 10.25” x 6” x 1"
Weight: Apx. 8.5"
Material: Saddle Grade Leather
Colonel (Most Full-Size)
Overall Flat Size: 15” x 6.5” x 0.25"
Size Folded Worn: 11.5” x 6.5” x 1"
Weight: Apx. 9.6"
Material: Saddle Grade Leather
No. You would need to use the Urban Carry G3 "Colonel" model holster, found by using the link below:
https://www.opticsplanet.com/urban-carry-g3-urbancarry-colonel.html?_iv_light-laser-attachment=yes
The Urban Carry G3 Lieutenant IWB Leather Holster most likely will not fit the M&P 4.25" model. Urban Carry recommends using the Urban Carry G3 Captain IWB Leather Holster for that handgun which can be found at the link below.
https://www.opticsplanet.com/urban-carry-g3-urbancarry-captain.html
The Urban Carry G3 Lieutenant IWB Leather Holster is the newest version of the G-line of holsters and would be my recommendation for the Walther PPK/S.
Yes it will.
No, this holster is for sub-compact handguns.