Model-1 Sales .300 / 221 Fireball

Model-1 Sales is a great source for low-cost .300/221 Fireball barrels, I know - I have an AR-15 built around one. The only problem is that the default threads are 1/2 X 36 - which is frustrating since most people build them to shoot suppressed and want to attach a 7.62mm suppressor. Suppressormounts.com has an easy, low cost solution - an adapter that threads onto the 1/2 X 36 threads and provides the industry-standard 5/8 X 24 threads for 7.62 accessories and sound suppressors. These adapters also feature 5/8 wrench flats for easy installation and maintenance.                          FREE SHIPPING to the continental US! $25.00 USD 5/8 X 24 Model-1 Sales .300/221 Fireball Thread Adapter for use with 7.62 mm accessories and sound suppressors

By purchasing Halcyon Defense thread adapters, I acknowledge that: Halcyon Defense produces precision thread adapters that are held to the most stringent quality control standards possible. The end user of Halcyon Defense products is responsible for ensuring that barrels, suppressors, and all other devices that Halcyon Defense thread adapters may be utilized with have threads that are concentric to the bore, and that any projectile that passes through these devices will do so without striking any component in the weapon system. Some manufactures do not adhere to the same standards and precise tolerances as Halcyon Defense, and Halcyon De mage to any component that occurs while using Halcyon Defense thread adapters.