Yes, the L1A1 is RH threads. You can use a metric barrel if you have the muzzle redone for the FH. Check, but I think the angled metric gasport will work fine with the L1A1 gasblock. Unless you need to drill it bigger.
I have several L1A1 builds going at the moment. I was lucky enough to hoard a few kits back when they were plentiful. I use nothing but Entreprise L1A1 receivers too.
At least on my Aussie builds.
For my Brits I'm going to have to get creative....
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