Compatibility:
• CZ 75 17rd magazine W/ SP0318
• CZ 75 compact 15rd magazine W/ SP0306
• Walther PDP 18rd magzines 
• Walther PDP/PPQ compact 15rd magazine
• Canik 18rd magazine
• Canik compact 15rd magazine
• Beretta 18rd magazine
• Beretta 17rd magazine
• Beretta Mec-Gar 18rd magazine
• Beretta compact 15rd magazine
• PX4 17rd magazine W/SP0614
• PX4 compact 15rd magazine W/SP0614 

Product Overview:
The Springer Precision extra power magazine spring for your magazines. The extra power spring is essential for reliability when adding any of our extensions to your magazines. For reliable performance, keep your magazine springs fresh.