Extra stock recoil spring, extra take down pins and a BT guide rod. After a few thousand rounds, I really think that changing the recoil springs every 100 rds is the way to keep the gun from breaking down. I use to use the wolf springs but they seem to wear down just as fast. I shot the gun often and really got to know the gun. After a while the trigger and recoil are non-issues. You really don't notice them. I discarded the laser a long time ago. Just do not care for them myself. The Hogue Handall grip seems slower coming out of a rear pocket holster, but does aid in the front holster. The grip is nice especially if you have long fingers like I do. I could care less about the recoil, but the grip does aid in handling the gun. I only shoot "Point and Shoot" style shooting, so I painted the front sight with "GLOW-ON". Glow on is the best paint out there. I used nitesighters in the past and really do not recommend them. Glow-on is fantastic. He really shines very bright. Also it picks up a light source very easily and stays active for a very long time. in fact, the light seems to stay glowing when I did not even use a light charge. It just picked up charge from simply taking the gun out of the holster from any light source. I bought the biggest jar they had, and it is enough to last a very very long time. You can do many guns with it. I also put it on my cell phone and tv remotes.
The only other recommendation I would recommend is a second LCP. Since it is your primary carry weapon, you need to shoot it often. The pistol is not meant for high volume shooting and will eventually break down. That is the time you will really miss it.