Check the listing for details. CZ USA 457 Series Aftermarket Trigger Pull Spring 8oz. Color: Silver, Condition: New. Listed at 15.99 USD. This spring is to assist you in your quest for an accurate setup. You can reduce your CZ 457 Bolt action trigger pull down to 8oz or less for your competition CZ 457. We often see nearly an 80 % adjustment. • This spring is rated at 5.2 lbs/in compared to the OEM spring rated at 48 lbs/in. This spring is aftermarket and is not made by CZ USA. A solid trigger is the foundation of improved accuracy, that allows a shooter to start seeing what the platform can really do. This will only work on the CZ 457 series rifles. All variants. Does not work with the Timney trigger nor does it work on the 452/453/455 platforms. We have other kits for that. This part is only one small step in a great trigger. Other components may raise or lower pull beyond given weight. Use caution when tuning. • Installation should be performed by authorized gunsmith, no directions are included as safe tool knowledge and rifle handling are a prerequisite for this part. • Made in the USA! Shipped safely and securely.