If you’ve been searching for the popular Castle Blast Shield, the wait is over.
The OTX Castle Blast Shield by Mid State Firearms is now back in stock and ready to ship. As the successor to the legacy Breek Arms Outside Threaded / Castle system, the OTX line continues the same proven design and remains fully compatible with existing Castle muzzle devices that use the 13/16×16 outside-thread interface.
Whether you’re replacing an older blast shield or building a new rifle, you can confidently add the OTX Castle Blast Shield to your setup without changing your existing Castle-compatible muzzle device.
Why Use a Blast Shield?
Muzzle brakes are excellent at reducing recoil, but they often come with a tradeoff: increased side blast and concussion.
Anyone who’s fired a short-barreled AR-15 or stood next to one at an indoor range knows how punishing muzzle blast can be.
A blast shield redirects those gases and concussion forward instead of outward, making shooting more comfortable for both the shooter and everyone nearby. They’re especially popular on:
- AR-15 pistols
- Short-Barreled Rifles (SBRs)
- Competition rifles
- Indoor range firearms
- Training rifles with aggressive muzzle brakes
Unlike a suppressor, a blast shield does not reduce the overall report of the firearm. Instead, it redirects the blast away from the shooter and those standing alongside the firing line.
Modular When You Want It
One of the biggest advantages of the Castle system is its flexibility.
Running the flash hider or muzzle brake by itself? Leave the blast shield off for maximum recoil reduction or flash suppression.
Need to tame concussion at the range or while shooting around others? Simply thread the blast shield onto the outside of your compatible muzzle device in seconds—no tools required.
This gives you the ability to configure your rifle for different environments without changing muzzle devices.
Fully Compatible with Legacy Castle Components
Many shooters have asked whether the new OTX products work with their existing Breek Arms components.
The answer is yes.
The OTX Castle Blast Shield is the direct successor to the original Castle Blast Shield and is compatible with:
- Legacy Breek Arms Castle Flash Hiders
- Legacy Breek Arms Castle Muzzle Brakes
- OTX Castle Flash Hiders
- OTX Castle Muzzle Brakes
- Any compatible 13/16×16 Castle-style muzzle device
If you’ve already invested in the Castle system, your existing components continue to work together seamlessly.
Compact and Lightweight
The OTX Castle Blast Shield was designed to provide blast redirection without adding unnecessary weight or bulk.
Features include:
- Slim 1.26-inch diameter fits inside most free-float handguards
- Lightweight 6061 aluminum construction
- Durable black anodized finish
- Only 1.6 ounces
- Quick installation and removal
- Made in the USA
Complete Your Castle System
Mid State Firearms also offers compatible OTX Castle muzzle devices, including:
- OTX 3-Prong Flash Hiders
- OTX Muzzle Brakes
- Complete Blast Shield Combos
Whether you’re replacing discontinued components or building a new rifle from scratch, the OTX Castle system gives you the same modular performance shooters have trusted for years.
Order Yours Today
Our latest shipment of OTX Castle Blast Shields is now in stock and shipping. Inventory on these has historically sold quickly, so if you’ve been waiting for a replacement or looking to build a modular blast management system, now is a great time to pick one up.
Browse the full lineup of OTX Castle Blast Shields, flash hiders, muzzle brakes, and combo kits today at MidStateFirearms.com.
