BMPS K25 Springs with Squared Ends

Custom made springs which are essentially various lengths of the McMaster k25 spring with closed ends (same coil-pitch/spring-rate for all). They are the same springs used in Zc Aus, Znc Aus, and Zinc .50 blasters, but can be used in a range of other custom foam dart blasters compatible with K25 or shortened K25 springs. See images for full specs for each spring length.

Full length K25 (280mm / 11") option coming soon!

Purchase as replacements for the Zc/Zc Aus, Znc/Znc Aus, Ziiiinc/Zinc .50, for a different K25 spring compatible blaster, or even for your own blaster in development.

Disclaimer, care, and safety: all blasters, parts, and products sold by BM Print Shop are used at your own risk and should only be assembled and used by an adult or with close adult supervision. Improper assembly, use, or modification has the potential to result in injury. When assembling our blasters, read the disclaimer warning on the first page of the assembly guide carefully before assembly and use. Print in bright colours and use in responsible locations/settings. Do not leave the blaster outside under sunlight or in a car that may get hot when not in use. Do not leave the blaster primed when not in use. Use responsibly including in responsible settings. Do not aim at eyes or face. Eye protection is essential for skirmishing.