One of the great humbling moments in my shooting career was about two years ago. I have been shooting for about three decades now, and have become quite proficient with my Glocks and M&Ps. So when I took my new Beretta APX out and was patterning like a shotgun, I assumed something was wrong with the gun.
At the bay next to me, a leathery, seasoned looking older guy was shooting with his preteen-ish kiddo. I said sir, sorry to bother you, if I gave you a box of ammo would you try this gun out? He sized me up, determined I wasn't a creeper, accepted the offer and proceeded to shoot ragged holes with the APX.
I got to know that it's usually not the gun, he got to look like John Wick in front of his kid, it was a good day for all.
The point of my ramble being that even similar guns do have a learning curve, and I've learned that if there's an issue, it's probably me. Not saying that's OP necessarily, but it's definitely the first thing to diagnose.