https://21stcenturyinnovation.com/buy-online/ols/products/nylon-cleaning-jags
This is the closest I’ve found. The shank isn’t quite as long, and the threads are nylon, not a stainless set screw so durability might be a concern.
Both brand new in the box. No barrel nut for handguard; this is for an Aero enhanced AR-15 upper, or you’ll need to buy the barrel nut for a different AR-15 upper. The 12” Area 419 rail bolts onto the handguard MLOK.
Sold together, no trades
$250, shipped (firm)
Brand new in the box for .223 Rem. Comes complete with .246” neck/shoulder bushing and .2225” mandrel and corresponding collet (decapping stem and collet included, also).
$300, shipped (no trades)