Walther PDP Compact 9mm vs Walther PDP F-Series 4" 9mm

These two share almost every figure: 15 rounds, a 4.0" barrel, 5.4" height, 1.34" width, a 6.4" sight radius, the same optic cut, the same four-part safety set and the same $699 MSRP. The Walther PDP Compact 9mm is 0.25" longer overall (7.5" vs 7.25") and 0.4 oz heavier (24.4 oz vs 24.0 oz), and both triggers are listed at 5.6 lb. What actually differs is the grip and the rear sight: the Walther PDP F-Series 4" 9mm uses a reduced-circumference textured frame, the PDP Compact the Performance Duty texture with interchangeable backstraps.

Pick the Walther PDP Compact if:

• You want interchangeable backstraps to tune the grip rather than a fixed reduced-circumference frame
• The adjustable 3-dot rear sight matters; the F-Series ships a standard rear
• Your hand fills the full-circumference Performance Duty grip

Pick the Walther PDP F-Series 4" if:

• A smaller grip circumference fits your hand better, which is the reason this model exists
• It is the lighter of the two at 24.0 oz
• It is 0.25" shorter overall (7.25" vs 7.5")
• You do not need an adjustable rear sight or swappable backstraps

Capacity, barrel, height, width, sight radius, optic cut and price are identical, and the 0.4 oz and 0.25" gaps are not decision-grade. This one comes down to whether the reduced-circumference grip fits your hand better than the standard frame with backstraps.