Main PagePhotos and Field StrippingInternal ComponantsDiagrams and M37 ManualsThe Allied Armament M37
Here are some photos of the internals, the retracting bar, link chute, and a comparison of the 1919A4 and M37 extractors. At the bottom of the page is a disassembly sequence.
The M37 back plate has a lip on each side which reinforces the side plates. The latch consists of a safety lock which is pushed to the right, allowing the latch to be depressed and the back plate removed by lifting straight up. A notched rod safety is pushed to the right for safe and the left for fire.

Retracting bar.

Lock frame.

Barrel extension.

Charging pin.

Bolt. Removal of roll pins (red arrows) allows alternate feed switches to be relocated when changing direction of feed.

Top of bolt showing triangular switches set up for right hand feed. These switches can be moved to the free set of holes for left hand feed.

Rear of the driving spring rod showing the dovetail which locked into a slot in the right side plate.
Addressing a complaint which has followed the .30 caliber Brownings since the adoption of the 1917, the main spring and rod were replaced with a captive driving spring, above, eliminating the need to lock a rod into the bolt before the back plate can be removed.
Several views of an M37 extractor next to a 1919A4 extractor. The 1919 extractor is left feed only and the M37 extractor is set up for right hand feed. Note the ejector is reversed on the M37 extractor.

Original link chute box with Saco-Lowell Shops markings.
Link Chute
The link chute is held in place by the belt holding pawl pin and is mounted on the opposite side of ammunition feed. In a tank mounting the chute would empty into a link bag.