I guess they got approval to sell these end caps now...http://www.silencershop.com/accessories/silencer-parts/silencerco-octane-9-end-cap.html
Video: https://www.youtube.com/watch?v=u_gXL_Pvh4k
Video: https://www.youtube.com/watch?v=u_gXL_Pvh4k
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