This spring spacer for the Dart Zone Pro MK-2.1 boosts the FPS by about 20 FPS (for the Standard). The Maximum version puts as much pre-compression on the spring as possible while still allowing the blaster to prime every time.
Don't store the blaster with either spacer installed preferably as it will degrade the spring over time. The Maximum spacer has diminishing returns on improvement but in order to get the best performance out of either of these, make sure to improve the seal on your blaster first.

DO NOT use with an upgraded/higher-FPS spring.

Installation: Moderate. Unscrew both sides of the priming handle. Open the body of the blaster or loosen the screws surrounding the prime handle area. Pop the plunger tube and spring out. Insert the spacer into the circular spring catch at the back of the blaster. Put the spring onto the plunger rod and insert the assembly back into the blaster spring first (into the spacer). This will be a very tight squeeze when doing so, just make sure you keep a firm grip on the blaster and the assembly.

Attribution: Designed by Transmogrification Labs.

Includes: 1x Dart Zone Pro MK-2.1 Spring Spacer (Standard or Maximum) or a set of both if selected. (Color is random, usually Black)

Notes about material: This product is printed in PETG material which offers superior thermal resistance and increased durability compared to PLA products. PETG has a higher glass transition temperature of 80°C whereas PLA is 60-65°C. For PLA, this is within range of the temperatures that often occur inside a vehicle during summertime so items made from PLA may end up warping in those situations. The same issue can possibly occur from exposure to direct sunlight if the temperature is high enough. PETG has a much higher glass transition temperature however so you are very unlikely to ever experience issues with it warping in addition to it just being stronger in general. PETG products do come at a higher cost than the same product in PLA because PETG takes longer to print and also requires more time to clean up after printing but the result is a very high-quality product.

Disclaimer: All of my products are printed and tested with the utmost attention to detail. Despite this, I am NOT responsible for any damage incurred to you or your blasters through the use of any of these parts alone or a combination with others. It is up to you to keep yourself and your blasters in functioning condition. Some prints may have visual imperfections as is common to all 3D printing (especially for PETG). These slight imperfections will not interfere with mechanical function or integrity/strength.


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