sm50 is fine dont have a break down of what it contains but its not just silicon its a mix ,i used it for years on seals but now i coat with anti scuff like gn paste ,then wet with dryslide type lube ,both high molly content this way every time you cock & fire your rifle it buffs itself in no need to put dryslide in compression tube
i can send you a sample of my moly lube (dryslide) but much thicker no charge if you pm me your addy
thanks dave