Smith Wesson MP Shield 9mm

My wife had a Ruger LCP 380. It had several problems so she replaced it with a Sig P238 380. This Sig did not like gun oil for lube between the slide and rail (2 failure to eject, each after about 50 rounds), instead we are using Lubriplate per Sig armorer recommendations with no problems now.
Am also looking into Apex trigger kit for MP Shield. Thanks mpd.