Modern Service Pistol Comparison — 2026

Walther PDP vs. Sig P320

The complete Walther PDP vs. Sig P320 comparison — specs, value, reliability, and which is right for you in 2026.

Head to Head — 2026

Walther PDP vs. Sig P320 — Complete Comparison

Two of the best modern service pistols — the Walther PDP (2021, lauded for best factory trigger) vs. the Sig P320 (US Army M17, proven military platform). Which wins in 2026?

SPECIFICATION	WALTHER PDP	SIG P320
Action	Striker-fired	Striker-fired — modular chassis
Caliber	9mm	9mm (and others)
Capacity (full-size)	18+1	17+1
Trigger Pull	~5.4 lbs (best factory polymer trigger)	~7 lbs (improving with P322)
Optics	Standard optic cut	MOS variant / standard on some
Modularity	Backstrap interchangeable	Full chassis swap — unique
US Army Adoption	No	Yes — M17/M18
Private Sale Value	$570–$720	$470–$720

Strengths

Where Each Wins

WALTHER PDP WINS AT:

✓ Best factory trigger of any polymer pistol — universally acknowledged

✓ Ergonomics preferred by many reviewers

✓ More rounds per magazine (18+1 full)

✓ AXG metal frame option available

✓ PDP F-Series includes red dot

SIG P320 WINS AT:

✓ US Army M17/M18 — proven military platform

✓ Modular chassis — swap grip modules

✓ Military adoption drives strong resale

✓ More caliber options

✓ M18 compact is an elegant design

✓ Larger installed base

The Verdict

For pure shooting pleasure and the best factory trigger, the Walther PDP wins. For military-spec provenance, modularity, and the deepest buyer pool, the Sig P320 wins. Both are excellent — PDP wins on feel, P320 wins on ecosystem.

2026 Private Sale Values

What Each Is Worth Today

Use gunprice.com/ for your specific valuation. Verify serial at GunClear.com. Sell on GunShare.com. Transfer via GunTransfer.com. Log in GunVault.co.

FIREARM	2026 PRIVATE VALUE	VALUE RETENTION	FULL GUIDE
Walther PDP Full 4″	9mm	$570–$720	Value
Walther PDP F-Series	9mm	$680–$860	Value
Sig P320 Compact	9mm	$470–$580	Value
Sig P320 M18	9mm	$560–$700	Value

FAQs

Comparison FAQs

Does the Sig P320 drop-fire issue still exist?

The original P320 had a reported drop-fire issue that Sig addressed with a voluntary upgrade (2017). Post-upgrade P320s and all current production are considered safe. Check production date and upgrade status when purchasing used.

Which has better resale value?

Sig P320 holds slightly better resale due to military adoption and larger installed base. Walther PDP is newer and holds 75–80% of retail.

The Complete System