I use Castrol Syntech in my Glocks, and it is the best for lubing guns I have found. If you use it sparingly and clean off the areas it pools, you will find that it works perfectly, and your guns shoot amazingly clean. As an example, I shot Front Sights 4 day handgun course, and at the end of each day swabbed the barrel clean, and just did a quci wipe down of the internals, and my pistol was the only one not to have a problem. PS a quart is about a century long supply.