HDWR - Pen springs

Because that typical K644 spring used in the DIY Nerf world isn't always the right choice...

Brought in a few others, different sizes and spring rates if you're looking to adjust trigger feel or need a little more pressure on the sear/catch. 

And now I've added more again as  to cover more and more designs / needs. 

First number is wire diameter - bigger is stronger, Second number is outside diameter, third is overall length. 

0.4x4x10mm

0.4x4x20mm 

0.45x4.5x15mm 

0.5x5x15mm

0.5x5x20mm

0.6x5x10mm

0.6x5x15mm

0.6x5x20mm

0.7x5x15mm