Justin is the founder of Nebraska Shooters. His interest in firearm training stems from his rural background on a ranch is Southwest Kansas where he was raised with respect for all firearms and learned to appreciate their value as a tool. Of course, there were also plenty of recreational opportunities to use firearms on the ranch when time permitted. With plenty of deer, coyotes, rattlesnakes and prairie dogs, SW Kansas was better than growing up in an arcade. After high school, Justin studied Construction Management at Kansas State University and was fortunate enough to pursue a career in road construction. Justin has worked for Dustrol Inc since 1997 and currently manages the northern division.
In 2009 he began developing the Nebraska Shooters range and started the process of obtaining official credentials for teaching NRA and Nebraska State Patrol firearm courses. For the first three years he only taught one CCW class per month, but in 2012 several things happened that launched Nebraska Shooters to the next level. Not only was there a surge in interest in guns and concealed carry classes, but he also started branching out and working with several other instructors. Since then, Nebraska Shooters has become the largest network of certified instructors in Nebraska and covers the entire state.
In the meantime, Justin continues to take classes and broaden his horizons as an instructor and shooter. In 2013 he became an NRA Training Counselor so that he could help prepare others to become instructors and he attends legal seminars and shooting clinics every chance he gets.
In 2017 he married Dorothy Grusing who is also an NRA counselor and together that lead the Nebraska Shooters team. They both strongly believe that they are occasionally instructors, but always students and never miss an opportunity to attend classes and seminars to keep themselves informed and sharp.
Recent training for Justin Grusing:
| Date | Trainer | Course | Hours |
| Jan 16-19, 2017 | Front Sight | Defensive Handgun | 40 |
| March 3-6, 2017 | Front Sight | Defensive Handgun | 40 |
| June 8-11, 2017 | Massad Ayoob | MAG-40 | 40 |
| Jan 13, 2018 | Brookside | Tac-Med | 8 |
| Jan 14, 2018 | Brent Craft | Threat Pattern Recognition | 5 |
| March 17, 2018 | Terry Lane Fitzgerald | NRA Muzzleloader Instructor Course | 20 |
| May 18-20, 2018 | John Farnam | Defensive Pistol | 20 |
| May 31-June 3, 2018 | Massad Ayoob | MAG-40 | 40 |
| November 24, 2018 | US Lawshield | Gun Shot Wound First Aid | 4 |
| Dec 28, 2018 | US Lawshield | Gun Law Seminar | 3 |
| March 9, 2019 | Dr. William Aprill | Inside the Criminal Mind | 9 |
| July 4, 2019 | Texas Lawshield | Adv. Gunshot Wound First Aid | 16 |
| July 27, 2019 | Dave Spaulding | Combative Handgun | 16 |
| September 28/29, 2019 | Dayle Hammock | NRA CCW Instructor | 32 |
| November 15, 2019 | Dick Clark | Laws of Concealed Carry and Interstate Travel | 4 |
| March 6-9, 2020 | Front Sight | Defensive Pistol | 40 |
| June 6, 2020 | Norm Hood | Thunder Ranch Condensed Advanced Pistol | 8 |
| June 7, 2020 | Norm Hood | Thunder Ranch Condensed Shotgun | 8 |
| July 11-12, 2020 | John Farnam | Defensive Pistol | 16 |
| August 14-16, 2020 | Tom Givens | Rangemaster Instructor Development | 24 |
| August 22-23, 2020 | Dave Spaulding | Kinetic Combative Handgun | 16 |
| August October 8-11, 2020 | Massad Ayoob | MAG-40 | 40 |
| October 16-18, 2020 | Chaz Macrander | Long Range Precision Rifle | 16 |
| March 5-8, 2021 | Front Sight | Defensive Pistol | 40 |
| June 6, 2021 | Norman Hood | Defensive Shotgun | 8 |
| July 10-11, 2021 | John Farnam | Defensive Pistol | 16 |
| Sept 9-12, 2021 | Massad Ayoob | MAG-40 | 40 |
| Sept 25, 2021 | Norm Hood | Thunder Ranch condensed Urban Rifle | 8 |
| Jan 24-25, 2022 | Front Sight | Tactical Handgun | 20 |
| Jan 26-27, 2022 | Front Sight | Adv Tactical Handgun | 20 |
| Apr 22-24, 2022 | Brian Zins | Bullseye Clinic | 24 |
| Feb 26, 2022 | Freeda B Me | SASS Range Officer | 8 |
| Aug 19-21, 2022 | Vicki Farnam DTI | Off-Body Carry Instructor Course | 24 |
| Sept 24, 2022 | Norm Hood | Low Light Pistol | 8 |
| Feb 27, 2023 | AWA | Stop the Bleed | 2 |
| May 27, 2023 | Defensive Solutions | Defensive Pistol I | 8 |
| May 28, 2023 | Defensive Solutions | Defensive Pistol II | 8 |
| May 29, 2023 | Defensive Solutions | Pepper Spray | 4 |
| Sept 15, 2023 | Karl Rehn | Force on Force Instructor Training | 8 |
| Sept 16, 2023 | Karl Rehn | Tactical Scenarios | 8 |
| Sept 17, 2023 | Karl Rehn | Advanced Pistol | 8 |
| Sept 19, 2023 | Norm Hood | Hojutsu Orientation | 3 |
| Sept 21, 2023 | Norm Hood | Hojutsu Qualification | 3 |
| Sept 23, 2023 | Norm Hood | Urban Rifle | 8 |
| Sept 24, 2023 | Norm Hood | Defensive Shotgun | 8 |
| Jan 27, 2024 | Pulse Finders | Stop the Bleed | 2 |
| Jan 18, 2025 | Pulse-Finders | Stop the Bleed | 2 |
| April 16, 2025 | John Hearne | Who Wins, Who Loses, and Why | 10 |
| April 17, 2025 | John Hearne | Cognitive Pistol | 16 |
| June 21-22, 2025 | P&N Training | Fighting Pistol | 16 |
| June 28-29, 2025 | Robert Vogel | Speed Pistol | 16 |