SKU: 817000057
UPC: 706397857769
MPN: MA0310
The M14 Gas Cylinder Lock is the threaded part that secures the gas cylinder to the barrel and retains the front band on the M14 and M1A platforms. It seats against the gas cylinder and indexes the front sight assembly so the whole gas system holds proper alignment under recoil. Shooters running an original GI rifle or a Springfield Armory M1A reach for this part when the existing lock is worn, stripped, or out of timing. It carries Springfield Armory part number MA0310 and is one of the small components that keeps an M14 gas system functioning as designed.
On the M14, the gas cylinder lock threads onto the gas cylinder and clamps the front band tight against the barrel. Because the M14 uses a separate screw-in gas plug that caps the system, the lock has to index correctly for the front sight to sit true and for the spindle valve and plug assembly to seal. A lock that won't time to the proper clock position will leave the front sight canted or the band loose, both of which show up downrange. This piece is a direct replacement that matches the original GI dimensions and thread pitch, so it drops into a standard M14 or M1A gas cylinder without modification. Keep one with your spare firing pins and springs in your rifle parts kit.
Reach for a fresh gas cylinder lock when you're rebuilding a gas cylinder, refinishing a front end, or chasing a front sight that won't hold zero. It pairs with the rest of the small parts that wear on a hard-used M14, and a clean lock makes reassembly faster after a teardown. Have a few patches and solvent on hand for the gas cylinder bore when you swap it, and check our cleaning supplies and tactical slings while you build out the rest of your M1A setup.
It threads onto the gas cylinder and clamps the front band tight against the barrel, while indexing the front sight assembly. Proper timing of the lock keeps the front sight true and helps the spindle valve and gas plug seal correctly so the M14 gas system functions as designed.
Yes. The M1A is the civilian-pattern version of the M14, and both share the same gas cylinder dimensions. This Springfield Armory part number MA0310 lock is a direct replacement that matches original GI thread pitch, so it fits a standard M14 or M1A gas cylinder.
Timing depends on matching thread wear between the lock and gas cylinder. A worn or stripped lock, or one paired with a non-standard cylinder, may not seat at the proper clock position. Installing a fresh lock often restores correct indexing so the front sight sits straight and the band clamps tight.
Yes. The M14 uses a separate screw-in gas plug that caps off the gas system. The gas cylinder lock secures the cylinder and front band, while the plug closes the front of the system. They are distinct components, so confirm which part you need before ordering.
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