Bandaids for Bullets? Range Bag First Aid Kit

Have any purchased and tried this new Glock 19 recently? I’m seriously considering purchasing this pistol because the trigger reach on the Gen3 version is a bit too long for my trigger finger. I read about some Failure to Eject malfunctions due to the recoil spring.

I would like to put together a first aid kit to put in my range bag, any suggestions.

I have the Surefire E2D LED Defender light. It came with two Surefire SF123A 3 Volt batteries. Its getting close to the battery change time. Does anyone have a battery preference brand? Are the Surefire batteries it came with the best bet for replacement ones?