K26 spring parts for HAVRAN foam dart blaster

These are 2 modified parts for Havran foam dart blaster that will allow you to swap it's original spring for a heavier “K26”.

This mod will increase it's muzzle velocity by ~10-15fps or ~3-5m/s at the cost of slightly increased priming force. You will also need a long barrel to get most out of this benefit. This is not worth the downsides in most cases but if you want maximum performance, the option is there.

K26 is named based on McMaster catalogue but you can also get it from places like blastertime.eu or outofdarts.com.

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2 new parts to allow spring swap.