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Armaspec
The Armaspec ARM891-BLK is a precision thread adapter designed for shooters who need to bridge different barrel threading standards on their AR platform or other modular firearms. This hub adapter accepts a 1 3/8"x24 external thread on one end and provides a 0.9x24 internal thread on the other, making it an essential component for builders working with non-standard or metric-threaded barrels, muzzle devices, or suppressor mounts. Built from stainless steel and finished in black, it's engineered to handle the rigors of range sessions and field use while maintaining the durability you'd expect from Armaspec's precision manufacturing.
Thread adapters like this one are critical when your barrel or muzzle component doesn't match your intended accessory—whether you're installing a suppressor, muzzle brake, or flash hider. The 1 3/8"x24 is common on certain AR builds and specialty barrels, while 0.9x24 threading appears in European and metric-based firearm designs. Rather than replacing components, a quality adapter lets you use the parts you have without compromise.
Armaspec's stainless steel construction resists corrosion and extends service life, particularly important if your rifle sees wet conditions or sits in storage between outings. The black finish resists light surface wear and blends with modern rifle aesthetics. As with all precision-threaded components, proper installation and torque specifications matter—consult your barrel and muzzle device manufacturer for recommended torque values to ensure a secure, safe fit.
| Brand | Armaspec |
| Model | ARM891-BLK |
| External Thread Size | 1 3/8"x24 |
| Internal Thread Size | 0.9x24 |
| Material | Stainless Steel |
| Finish | Black |
This adapter accepts barrels or components with 1 3/8"x24 external threads and allows you to attach devices with 0.9x24 internal threads. Verify your specific barrel and muzzle accessory threading before purchase—thread size and pitch must match exactly for safe operation.
Thread adapters can be used with suppressors, but only if the internal thread size (0.9x24 in this case) matches your suppressor's design. Always confirm compatibility with both your suppressor manufacturer and the barrel threading before installation.
While not explicitly stated in the product specifications, quality thread locker is standard practice for all critical firearm thread connections. Consult your barrel manufacturer's recommendations for torque values and any specific assembly instructions.
Armaspec
The Armaspec ARM891-BLK is a precision thread adapter designed for shooters who need to bridge different barrel threading standards on their AR platform or other modular firearms. This hub adapter accepts a 1 3/8"x24 external thread on one end and provides a 0.9x24 internal thread on the other, making it an essential component for builders working with non-standard or metric-threaded barrels, muzzle devices, or suppressor mounts. Built from stainless steel and finished in black, it's engineered to handle the rigors of range sessions and field use while maintaining the durability you'd expect from Armaspec's precision manufacturing.
Thread adapters like this one are critical when your barrel or muzzle component doesn't match your intended accessory—whether you're installing a suppressor, muzzle brake, or flash hider. The 1 3/8"x24 is common on certain AR builds and specialty barrels, while 0.9x24 threading appears in European and metric-based firearm designs. Rather than replacing components, a quality adapter lets you use the parts you have without compromise.
Armaspec's stainless steel construction resists corrosion and extends service life, particularly important if your rifle sees wet conditions or sits in storage between outings. The black finish resists light surface wear and blends with modern rifle aesthetics. As with all precision-threaded components, proper installation and torque specifications matter—consult your barrel and muzzle device manufacturer for recommended torque values to ensure a secure, safe fit.
| Brand | Armaspec |
| Model | ARM891-BLK |
| External Thread Size | 1 3/8"x24 |
| Internal Thread Size | 0.9x24 |
| Material | Stainless Steel |
| Finish | Black |
This adapter accepts barrels or components with 1 3/8"x24 external threads and allows you to attach devices with 0.9x24 internal threads. Verify your specific barrel and muzzle accessory threading before purchase—thread size and pitch must match exactly for safe operation.
Thread adapters can be used with suppressors, but only if the internal thread size (0.9x24 in this case) matches your suppressor's design. Always confirm compatibility with both your suppressor manufacturer and the barrel threading before installation.
While not explicitly stated in the product specifications, quality thread locker is standard practice for all critical firearm thread connections. Consult your barrel manufacturer's recommendations for torque values and any specific assembly instructions.
