Fulton Armory's M1A HUB Mount Fixes Threads, Not the Whole Project

Fulton Armory now sells a $89.95 adapter that converts the M1A/M14's oddball .595×32 muzzle threads to the common 1.375×24 HUB pattern, and GarandThumb's review lays out exactly where it helps and where it doesn't.

Snapshot

GarandThumb's write-up is a specifications-based look at Fulton Armory's M1A/M14 HUB Mount, covering fitment, installation and the practical limits of using it to suppress an M14-pattern rifle. The piece's main finding: the mount solves the thread-compatibility problem cleanly, but suppressing an M1A still involves gas-system, front-sight and alignment work the adapter alone doesn't handle.

Key points

• Fitment: The adapter is rated for 18.5- and 22-inch M1A/M14 barrels, and it also fits 18-inch models, though those require removing the mount to access and clean the gas piston.
• Build: It's machined from hardened 4140 steel with a nitride finish, running rifle-side .595×32 threads to a 1.375×24 HUB interface on the suppressor side.
• Front sight tradeoff: Because the stock M14 flash suppressor assembly carries the front sight, installing this mount can leave the rifle without its original sight mount, something GarandThumb notes isn't included or solved by the adapter itself.
• Gas system caveat: The review stresses that suppressors can raise backpressure on the M1A's operating system, and since the rifle lacks a simple adjustable gas setup, owners may need an aftermarket adjustable gas plug to keep things from running too hard.
• Alignment matters: GarandThumb recommends checking bore alignment with a rod after installation, since misaligned threads or an improperly seated adapter can risk a baffle strike.

Quick take

GarandThumb's reviewer calls the mount a practical, fairly priced fix for a muzzle-thread problem that's dogged the M1A/M14 for decades, but frames it as one piece of a larger project rather than a drop-on suppressor solution. Anyone running one of these rifles unsuppressed should read the full breakdown before ordering.

Read the full story: garandthumb.com