Silencerco Centerfire Thread Protector .578x28 TPI Available to order on-line. Ships in 5-14 days $21.00 MSRP Price: $20.76 Description Details Reviews Shipping info Centerfire thread protectors made from stainless steel. UPC: 817272015560Manufacturer: SilencercoModel: AC1361Category: PartsOtherStock: Ships in 5-14 business days.Unit/Measure: ea This item may be shipped directly to your home address, unless you live in a restricted state.