yeah i think he's talking about those weird shaped rails all over house decks... im sure you can slide them, the only metal rails ive ever had a problem sliding are fucking aluminum rails. whoever had the idea to make aluminum rails can burn in hell
i know people who have done them. the sturdiness (probably not a word) is often an issue i think and also it seems like those things rust and stuff pretty easily. but if you've got one that's smooth and not wobbly, go for it.
One time my mom was like what are you listening to and I was like"elton john"and she was like "relly I didnt think you liked that kind of music" and I was like"featuring Tupac bitch JEA JEA" ---gunitthuggin