Try ATRS, I think they are making some.
Arms East should have their complete SPR upper done soon
The 17.25 barrels are finished now, but we haven't received the forearms planed for the builds yet. I guess they are available as is if someone wants to use their own rail or with handguards.
However, not 1/7 the OP is looking for, they're 1/8. 556M chamber and 11deg crown.
Also available with shaved FSB, and without sling swivel.




























