I've been deciding upon and acquiring parts for my AR 308 build slowly but surely, and I've got most of it figured out, but I haven't yet settled on a handguard. I've been looking at the SLR Rifleworks 308H ION 16" Lite Handguard with MLOK slots. I have a Rainier Ultramatch 18" barrel on the way, and I'd like the handguard to cover the majority of the barrel. Any ideas on other options?