Linear Latch Mechanism

[SNIPE]

I'm making a pistol from lego technic but rather than using unreliable rubber bands, I want to use springs which are placed over axles.

The parts which need springs are:

The firing pin

The magazine

And The latch, which keeps the firing pin pulled back, (the trigger releases it).

The problem I have is, although I have seen stepper mechanisms such as in the lego technic porshe gearbox, those are rotary, not linear.

I would need a linear mechanism in order to lock the firing pin when the slide is pulled back (I.E when  the firing pin spring is compressed).

Is there a way this can be done in lego technic?

Here is a diagram of the slide and firing pin. The grey parts are the firing pin and (simulated) spring and the black parts are the slide.

Edited December 22, 2016 by SNIPE