Glad you brought that up Sha Do we have used them in a trail run of skills practice"Caps" at the store using Bam airsoft reactive targets using AEG's +/- 400 fps denting but breaking in two off the sides, but outdoors they are a cats ass you have a hard time seeing them. As for N force and joules, always practice your ten foot rule and get em with a Knife "To close with and Destroy",
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