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.
-300x300.png "15' Gen1 Free Float Quad Rail, photo")
sound of freedom – This was a great set up. I loved being able to customize the set up. Only issue I had was my own fault as a newb to building these. I used a heavy barrel in a slim hand guard. It makes adding attachments tough with clearances. Hoping someday to also get an AR10 from here.