lock frame

lock frame

[′läk ‚frām]
(ordnance)
A mechanical unit in certain firearms, used to assist in unlocking the bolt from the barrel after recoil has started.
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References in periodicals archive ?
The last major component is the lock frame. The lock frame is stationary and contains the trigger and accelerator.
The force of the weapon firing results in the barrel, bolt and barrel extension moving rearward together for about 5/8 inch until the cams on the lock frame force the bolt lock down, unlocking the bolt from the barrel extension, allowing it to continue to the rear on its own.
Depress the plunger and pull the lock frame, barrel extension and barrel out of the casing.
Attach the lock frame to the rear of the barrel extension.
The bolt, barrel extension and lock frame must all have clearance milled into their right sides so they can be assembled into the casing.
Caption: Field strip, step six: Push in the trigger pin through the hole in the casing to release the lock frame.
His A8 Slimline folder, with its upswept 3.25-inch Tanto-style blade and lightened titanium integral lock frame, exemplifies his fine work.
These include a shorter lock frame and cylinder, a removed cylinder gas ring and the barrel/cylinder gap is placed almost directly over the front of the cylinder axis.