Be really, really careful about shooting jacketed ammo through a Glock before thoroughly cleaning the barrel after shooting lead ammo.
The lead will build up in the polygonal rifling like it will a heavily worn conventional bore. Then, run a high pressure jacketed bullet through it, and the first shot or two will have greatly increased pressures causing the "issues". (BTDT).
From my reading and experience, and that of co-worker, most of the Glock reload issues involve "factory-reman." reloads, and shooting warm-ish jacketed ammo through the gun with significant lead buildups. Reloaders tend to turn out a superior product, and check the chambering of their ammo before going to the range. Firing out of battery is due to failure to chamber fully. Inspect ALL ammo before loading it in the magazine. Check for dinged/damaged bullets and mis-seated or absent primers. (**IT happens !).
If you'll simply use brass in good condition, use reasonably hard alloys, (most of the producers of commercial cast bullets use Taracorp Magnum alloy, which is more than hard enough not to lead with normal lead bullet loads), and clean frequently.
Clean barrel with good lead-removal solvent and brush thoroughly before running jacketed bullet ammo, and you'll be OK.
Most of the lead bullet issues occured with early factory lead bullet ammo with soft swaged lead bullets. These leaded badly, just like the .357mag swaged lead factory ammo does. Most of this ammo has been discontinued and shot-up. However, the issue still comes up frequently.
