SilencerCo Thread Protector AR Style. Specifications for SilencerCo AC1360 Thread Protector AR Style Steel: Mfg Item Num: AC1360 Supplier SKU: 24548 Category: FIREARM PARTS Finish: Black Type: Thread Protector Model: AR Style Dimensions: 1/2x28 Material: Steel Thread Pattern: .5x28 tpi The SilencerCo Thread Protector AR Style Steel is a quality addition to the SilencerCo lineup. For more great deals on Muzzle Devices by SilencerCo please browse our SilencerCo Gun Parts page. Thread Protector for 1/2 x 28 thread pitch