Technical information

Practical A.E.G Upgrade 2006

Installing a long spring: tricks and potential danger.

Installing a short spring: tricks and potential danger.

A M100 spring is considerably longer than a stock TM spring:

Let’s refer to the picture below. The sector gear keeps rotating anti-clockwise,

and the piston is being driven to (almost) the leftmost position. If the spring is

too long (meaning the compressed length exceeds what can be accommodated

by the piston at the leftmost position), something will break (refer to the

Troubleshooting section) or the gun will get locked up. And, according to a

professional spring manufacturer, it is always NOT recommended that a spring

be operated near “length before set” due to inaccurate loads resulting from the

non-linearity of the spring rate when approaching maximum compression.

To minimize the chance of running into problems, when installing a long spring

you should remove any spacer on the spring guide (OR inside the piston). While

a ball bearing spring guide is a good idea, it itself is also a spacer with significant

thickness.

On the other hand, if you are to install a spring that is significantly shorter than