The SilencerCo Thread Protector in .578×28 (brand part no. AC1361) caps the end of a threaded pistol barrel so the threads stay crisp when no suppressor is mounted. It twists on by hand, and SilencerCo cautions to take care not to cross-thread it. The .578×28 pitch is the one SilencerCo ties to most US-made .45 ACP barrels. It keeps dust and debris out of the threads, which is all a thread protector has to do, and the thread pitch is the detail to get right.

Key Specifications

• The thread pitch is .578×28, which has to match the barrel it protects.
• SilencerCo states it is compatible with most US-made .45 ACP barrels, a quick way to confirm the pitch.
• It installs by twisting on the end of the barrel, with no tools needed.
• It keeps dust and debris from clogging the threads when no silencer is in use.
• SilencerCo suggests it for transport, when the threads are exposed and nothing is mounted.

Frequently Asked Questions

Which barrels does the .578×28 thread protector fit? It fits barrels threaded .578×28. SilencerCo says this pitch is compatible with most US-made .45 ACP barrels.

How do I install it? Twist it onto the end of the barrel by hand, taking care not to cross-thread it, and it keeps dust and debris from clogging the threads when no silencer is in use.

Does a SilencerCo threaded barrel already include one? SilencerCo says its threaded barrels come with a thread protector, so this part is for an extra or replacement protector.

Buy the SilencerCo Thread Protector, .578×28

Exposed barrel threads pick up dirt and dings fast, and a protector costs very little next to a damaged barrel thread. Order this .578×28 version from our Lubbock, Texas gun shop for fast direct shipping, and browse more Class 3 parts and accessories while you are here.