In agreement with dieDoktor, his 249 Outer Barrel Doohickey is for sale here.
This protects the outer barrel/hop chamber for transport, especially if you are shipping it in a giant Pelican case you found in a dumpster where the total package weight is 140 pounds.
Color may vary.
All packages are insured! :)
"Worst Case" lead times are below, but your order may ship earlier:
1-2 Month Lead Time: WE M4 depending on resupply delays.
2-Week Lead Time: KWA Vector Adapter
2-3 Day Lead Time: Stock Adapters, Kyle/Meme Amplifiers