You can find the LanTac Dragon Muzzle Brake 9mm 1/2-28 here.

The LanTac Dragon Muzzle Brake for 9mm is designed to reduce recoil and muzzle rise by quickly dissipating the muzzle blast gases, which reduces the flash signature as well. The unique Short Energy Pulse system reduces the amount of recoil, which can allow for more accurate follow-up shots for full auto fire or rapid semi-auto fire. Manufactured to the highest quality standards out of hardened Mil-Spec steel and phosphate-coated. Made in the USA.

Specifications:

• Caliber: 9x19mm
• Material: Hardened Milspec Steel
• Finish: Phosphate
• Dimensions: L: 2.660'', DIA Body: 0.866''
• Weight: 2.8oz
• Thread: 1/2-28 UNEF R/H