OTX CASTLE BLAST SHIELD Concussion Device

OTX Castle Blast Shield by Mid State Firearms – Compatible with Legacy Breek Arms Castle System

The OTX Castle Blast Shield by Mid State Firearms is the direct replacement for the legacy Breek Arms Castle Blast Shield. Built to the same proven design and fully compatible with existing Castle muzzle devices, the OTX line ensures current owners can continue using their existing setups while new customers benefit from continued production and support from Mid State Firearms.

Important: This blast shield does NOT thread directly onto your barrel. It is designed for use only with compatible 13/16×16 outside-threaded OTX muzzle devices.

Direct Replacement for the Breek Arms Castle Blast Shield

If you’re looking for a replacement or additional blast shield for your Breek Arms Castle muzzle brake or flash hider, the OTX Castle Blast Shield is the correct solution. It uses the same mounting interface, threads directly onto legacy Castle-compatible muzzle devices, and offers the same compact size, lightweight construction, and forward blast redirection.

Whether you’re replacing a worn unit or expanding your rifle setup, the OTX Castle Blast Shield maintains full compatibility with the legacy Castle ecosystem.

Reduce Side Blast and Concussion

Aggressive muzzle brakes provide excellent recoil reduction but can produce significant side blast and concussion. The OTX Castle Blast Shield helps redirect muzzle blast, noise, and gases forward and downrange, making shooting more comfortable for the shooter and those nearby.

This is especially beneficial on:

• Short-barreled rifles (SBRs)
• AR-15 pistols
• Indoor ranges
• Team shooting environments
• Training classes

The blast shield threads on or off in seconds without tools, allowing you to switch between maximum muzzle brake performance and reduced side concussion depending on your shooting conditions.

Slim, Lightweight Design

Designed to fit modern sporting rifles without unnecessary bulk, the OTX Castle Blast Shield features:

• Slim 1.26-inch outside diameter fits inside most free-float and slim-line handguards
• Compact 2.15-inch overall length
• Lightweight 6061 aluminum construction
• Durable black anodized finish
• Only 1.6 ounces

Compatibility

The OTX Castle Blast Shield is compatible with:

• OTX Outside Threaded Muzzle Devices by Mid State Firearms
• Legacy Breek Arms Castle muzzle devices / Outisde threaded line
• Any compatible 13/16×16 TPI outside-threaded OTX/Castle system

It does not mount directly to barrel threads. It mounts to our compatible 13/16 muzzle devices.

Specifications

• Manufacturer: Mid State Firearms
• Product Line: OTX
• Material: 6061 Aluminum
• Finish: Hard Anodized
• Weight: 1.6 oz
• Length: 2.15″
• Outside Diameter: 1.26″
• Mounting Thread: 13/16×16 TPI
• Fits Most Slim-Line Handguards

Important Information

The OTX Castle Blast Shield redirects blast forward but is not a suppressor and does not significantly reduce firearm noise. Always wear appropriate hearing protection while shooting.

Packaging: These are surplus inventory and may ship without retail packaging.