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yes it will fit just fine see *******UPC 698958101841 ID 16965 Category Optics > Sights / Lasers / Lights Manufacturer Walther Type Laser/Light Color Olive Drab Green Weight 0.200 Length 1.9" Battery CR2 Lithium Candle Power 5 Lumens Diameter .5" *****PK380 LASER Custom red laser sight

Hi William and welcome. Yes Sir, this is specifically made to fit the Walther PK380. Cheers, stay safe and enjoy!

Hi William, yes sir, this is made for the PK380, not sure why Bud's doesn't have that in the description. Also, this item appears to be discontinued. Here is one that will work >>> amazon.com/Lasercross-Magnetic-Charging-Shockproof-Picatinny/dp/B085BS3GTD Stay safe & have a great day!