I just recently traded into a Glock 40 Gen 4. I was told that it had an aftermarket guide rod/spring, he ended up keeping the KKM barrel that was on it. I am looking at doing some light upgrading on the gun. I have looked at the Alpha Wolf threaded barrel and the Lone Wolf compensator, as well as the Lone Wolf guide rod/spring assembly. Anybody on here have a different setup they recommend? I am mainly using this for a deer slaying pistol. Any recommendations are welcomed.