I started with plain black, then went to fiber, then switched back to black. I feel like I can focus "harder" on a serrated plain black sight. I actually see the serrations while shooting.
Just shoot cast bullets out of the stock Glock barerll. I did it for years.... 25k through my 35. Just don't shoot a bunch of cast then shoot jacketed....or the barrell may bulge.
You can buy cast bullets here..... www.shooterready.biz