My wife started competing in USPSA in May 2018, using a Glock 34. She was very familiar with the Glock, having carried one for twenty five years. She shot the G34 through June 2019, and had significant shooter’s elbow pain the entire time she shot the Glock. Her elbow pain was constant, and every week she would have to taper down her shooting in the latter half of the week, so as to be able to shoot matches in the weekend.
In July 2019, she switched to the X5 320, and shortly thereafter to the 320 X5 Legion. For those not familiar, the Legion has a Tungsten frame, and her pistol weighs 44.5 ounces with an empty magazine. Almost immediately after making the switch, her elbows started improving, and for the last month plus she has had no elbow pain.
Our theory is that she had to grip the lightweight polymer frame more, especially side to side, to control recoil. Whatever it is, it has made a major contribution to her quality of life.