I usually try to have the front sight covered when I build a holster because its hard to form a sight tunnel in the leather that will keep the front sight from catching on a draw if you twist the gun at all.
I don't go for closed bottom holsters though, I like for debris to be able to fall out. I train horses and do farm repairs/fabrication. Arena dust and hay chaff can get ANYWHERE. I carry a fixed blade knife in a leather sheath that is boned down tight enough the knife pops in place like its kydex and about once a week I have to clean a surprising amount of hay chaff out of the bottom of the sheath. My gun gets dusty and needs blown off/cleaned occasionally but nothing ever accumulates inside the holster.
I don't go for closed bottom holsters though, I like for debris to be able to fall out. I train horses and do farm repairs/fabrication. Arena dust and hay chaff can get ANYWHERE. I carry a fixed blade knife in a leather sheath that is boned down tight enough the knife pops in place like its kydex and about once a week I have to clean a surprising amount of hay chaff out of the bottom of the sheath. My gun gets dusty and needs blown off/cleaned occasionally but nothing ever accumulates inside the holster.