JMAC Customs X37 Bravo Thread Protector

JMAC Customs X37 Bravo Thread Protector JMAC Customs X37 Bravo Thread Protector TP-37 Thread Pitch: 1.375-24 Material: 17-4 Stainless Steel Black Nitride Coated JMAC Customs X37 Bravo Thread Protector. The TP-37 is the perfect addition to your X37 Series Muzzle Device and will protect your 1.375-24 threads from potential damage and will compliment the overall look of your device.