ALEXANDRIA, Va., Jan. 29 -- United States Patent no. 12,209,829, issued on Jan. 28.

"Firearm silencer and muzzle accessory coupling device, user compatibility improvement" was invented by Austin Reis-Green (Watertown, Wis.) and Evan Reis-Green (Juneau, Wis.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A firearm muzzle accessory coupling device improvement system and method. The coupling device provides a front alignment taper of 17-25 degrees included angle, and an intermediate outer diameter providing a thread of 14 to 18 threads per inch. The muzzle accessory provides a mounting interface socket having an operatively associated thread on the inner circumference of a through bore. The threads of the coupl...