Glock factory barrels are not intended for use with reloaded ammunition or lead bullets.
KKM & LWD barrels feature standard grove & land rifleing which works great with plated, jacketed or lead bullets AND have tighter chambers so they are easier on the brass. Both are great performers and will deliver a life time of service.
The KKM costs more than the LWD. Why would you pay more for a product that delivers the same benefits?