I just recently purchased a Ruger SR40 from a friend that bought it new 2.5 yrs ago. He had someone do a trigger job to the gun, but unfortunately the gun was tobhard for him and his daughter to rack the slide and they never shot it after the trigger job so I bought it. I took it out to go shoot my plate rack yesterday and on the last rd it blows the magazine out every time. I’m not sure what is causing this for I haven’t had the chance to tear it down. I’m hoping to get some help from you guys and hoping to not have to send it back to Ruger. Any help would be greatly appreciated.