TriggerHapticPulse For Shooting range vr

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Hello,
I use the Shooting range vr on the unit 2017.3.0f3, it's perfect but it misses a little thing! The haptic feedback on the gun! I tried several things with the steamvr base "TriggerHapticPulse", I did not succeed.
Would you have an idea to propose to me because the immersion is much less good without the haptic !!!
Thank you in advance!!!!!