That is a good question.
DSA in Barrington, IL completed a batch of L1A1 inch-patterns and is sold out -- I'm told -- but check with them.
Entreprise, Inc. in Irwindale, CA I believe is sold out on theirs also. I would check with Lily at Entreprise to see if they have one kicking about. [Yeah, yeah, yeah. I've heard all the stories about their quality and all the other nay-sayers. The fact is, I have four (4) inch-pattern rifles -- Aussie (Vietnam War-era) L1A1, Aussie L1A1-F1 (Papua New Guinea Defence Force), Brit L1A1 (Falkland's War), and Canadian C1A1 replicas -- all built on Entreprise receivers and they all run flawlessly.]
If all else fails, go to the FAL Files (
www.falfiles.com) and see if someone has an inch-pattern they want to sell. The inch-pattern kits have pretty will dried up, so unless you want to make one from a Type 3 metric-pattern, those are your choices now as I see things.
Sorry if I rained on anyone's parade, but the Commonwealth variants of FAL are less common than the metrics in terms of sheer numbers produced (and hence, a source of parts to re-build into a replica rifle). Couple this with insane government policies regarding sales of parts in the U.S., Canada, UK, and Australia, and you have a prefect storm for builders who want one of these rifles.