McGlinchey was so big for his age that as a child, his parents would make sure to bring his birth certificate to his basketball games. Later, at age eight, he was hoping to make his debut in youth football, but decided against it after the league's directors told his family that they would have to place him on a team with eighth and ninth graders due to his size. Embracing such a large frame as a child, McGlinchey constantly threw his weight around with his big family, which featured 22 cousins and 5 siblings. Even at his grandmother's wake, McGlinchey and his extended family engaged in a pickup football game while still dressed in their suits. As Mike puts it, "That's the way she would have wanted it."
NFL players had the opportunity to participate in the NFL's annual My Cause, My Cleats campaign during a designated home game between Weeks 13-15 of 2018. McGlinchey and his teammates represented their respective causes with custom-designed cleats in an effort to raise awareness and funding. Autism Speaks is dedicated to promoting solutions, across the spectrum and throughout the life span, for the needs of people with autism and their families.
McGlinchey and his fellow rookies participated in the annual 49ers Mentorship Academy on September 18, 2018. The Mentorship Academy, partnering with USA Football, is a three-step program designed to provide high school football players with the opportunity to develop the skills necessary to succeed and be leaders on and off the field. The rookie class invited the high schoolers to the team facility, where they shared opinions and lessons over a meal and fun competitions.
The 49ers worked alongside the humanitarian-relief organization Convoy of Hope on December 4, 2018, and hosted 1,500 guests in-need from Bay Area nonprofits and schools at Levi's® Stadium for a free holiday resource fair. McGlinchey and his 49ers teammates distributed groceries, toys, books, shoes and other holiday offerings to the guests. The attendees also received haircuts, utilized health resources and took family portraits or professional headshots. Convoy of Hope is a nonprofit organization that directs children's feeding initiatives, hosts community outreach programs and provides disaster response resources to those in need in the Bay Area and throughout the world.
McGlinchey and his teammates surprised guests of the CityTeam Men's Program and House of Grace on November 20, 2018, at Levi's Stadium. The group believed they were just taking a tour of the stadium, but they were in fact joining the 49ers players for a night full of exciting events. The guests received a makeover and haircut, selected a new outfit from Dockers, snapped a new headshot and then shared a Thanksgiving dinner with the 49ers players.