So I was on the shooting range and right next to those real weapons

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So I was on the shooting range and right next to those real weapons there were guys playing with those laser toys. They were in shape of real pistol, inside there was a laser and when they pulled the trigger, the laser was getting activated.

So I've been thinking, that maybe I could build such a mechanism myself. Benefits:

>I could practice shooting at any time.
>And I would pay no money for it, once the system gets implemented.
>And while it would certainly not replace standard range practices, it might certainly limit them.

What I want to have:

>Fake weapon with guts removed from it.
>With laser inside
>With something to generate fake knock back inside the weapon
>Make it emit sound through headphones, preferably those would be connected to some other device, not directly to the pistol.
>Make the target reacting to laser

How I plan to do it:

>Buy fake weapon, since they are legal around here.
>Buy laser pointer toy
>Dismantle both, attach one to another by whatever means - I don't think its going to be any troublesome.
>Sound issue: put raspberry Pi zero inside, attach wifi module to USB. Module sends signal to cellphone through WiFi, cellphone through specially written app sends signal to headphones to emit "bang" sound.
>Raspberry Pi zero is powered by the battery.
>Target reacts to laser pointer and sends signal to ATMEGA8, that will collect points and pottentially measure distance from previous shots in some similar to clustering fashion.
>Atmega sends data to digital point counter.

The questions, that are worrying me, though are:

>How do I simulate the knockback? I plan to use it in my flat, surrounded by neighbours. So it must be something silent. But I have no idea how to generate such a force, even with making the noise. Without making noise, it seems very hard.
>How do I make the target? What material generates or loses power, once laser beam hits it's surface? Since I'm a programmer, I have no idea.