CRBN S63 Nano Barrel TipThe CRBN S63 Nano Barrel Tip is designed for use with all Planet Eclipse S63 Barrel backs (or other compatible barrel backs). With over 700 micro ports, you'll get a reduced sound signature, and prevent water, debris or bunker rub from entering the barrel front, ensuring top notch performance! The barrel tip itself weighs 1. 5 oz and gives a 14. 5" overall barrel length. FEATURES: Nano Porting weather resistant! Quiet sound signature while shooting 1.