Fulton's New HUB Mount Fixes M1A Threads, Not the Whole Problem
Garand Thumb breaks down Fulton Armory's new M1A/M14 HUB Mount, a $89.95 adapter that converts the rifle's oddball .595x32 muzzle threads to the standard 1.375x24 HUB interface, and walks through what the mount actually fixes versus what still has to be sorted out before anyone bolts a suppressor on.
Snapshot
The article reviews the specs and fitment of Fulton's new adapter rather than claiming live-fire testing, focusing on which M1A and M14-pattern rifles it fits, what it does to the front sight, and why the M1A's gas system still needs attention even after the thread problem is solved.
Key points
- Thread conversion: The mount is hardened 4140 steel with a nitride finish, going from .595x32 on the rifle to 1.375x24 HUB on the suppressor side, listed under part number FA-M-186.
- Barrel fitment: It fits 18.5-inch and 22-inch barrels directly, and fits 18-inch barrels too, but Fulton says it must come off for gas-piston cleaning on that length.
- Front sight casualty: Removing the original flash suppressor assembly to install the mount can take the front sight's mounting point with it, meaning iron-sight users need a separate gas-lock front sight base not included in the price.
- Gas system still a problem: The piece notes the M1A lacks a simple external gas adjustment, so suppressor backpressure can mean harsher extraction and added wear unless owners look at adjustable gas plugs or lower-backpressure cans.
- Alignment check required: Every installation needs a bore-alignment check with a proper rod, since misaligned muzzle threads or a poorly seated adapter can cause a baffle strike.
Quick take
Garand Thumb's write-up treats this as a genuine fix for a thread pattern that's been a headache since the 1950s, while making clear it's one piece of a larger project. Anyone suppressing an M1A still has to handle the front sight, the gas system, and alignment themselves.
Read the full story: garandthumb.com