I'm fairly new to the Glock world. I almost bid on a G19M product number PM1950333 that is said to be a Lipseys model but not stated in the ad. A PM195F30A is said to have the nDLC coated internals. Up to the last week or so, I didn't even know of a 19M. I'm confused on these models! I'm assuming the nDLC coated model is better, is it?