Vector Thread Protector KRISS $14.95 This is the OEM Thread Protector for your KRISS Vector Pistol, SBR, or SMG. Thread protector is caliber-specific. Caliber Thread Pitch 9mm 1/2" x 28 RH 40S&W 9/16" x 24 RH 10mm 9/16" x 24 RH .45ACP M16x1... Choose Options