The Hyde-Bendix was a carbine that entered the 1940 light rifle trials.
In trials the reports were:
4. Its general functioning was excellent except for failures of the mechanism to close. This was felt correctable by use of a stronger operating spring.
5. Endurance was excellent, with the exception of the connecting rod. It was suggested that this could be corrected by a better method of fabrication of this part.
6. Its accuracy at 100 yards was excellent, although at 300 yards the extreme spread was somewhat greater than expected.
7. Recoil was very light.
8. Functioning in simulated rain was fair, and its functioning in dust was excellent.
9. Its functioning when held in unusual positions and when held lightly was excellent.
10. In ease of care, disassembly, etc. the rifle was excellent.
11. The rifle was excellent in ease of hand operation, except for the fact that the operating handle was not connected to the bolt so that the latter could not be pushed closed.
The first variant was a gas-operated design, and the only entrant to use a pistol grip. Dimensions were 33.6 inches long with a 15.75 inch barrel and a weight of 5.3 pounds, and fed from a 5-round magazine. The rifle performed well through trials, with excellent performance in dusty conditions, excellent accuracy, light recoil, and simple to field strip and maintain. The committee recommended that it to be modified with a stronger recoil spring and mechanism to allow the bolt handle to be used to force the bolt closed (the original design could only pull the bolt open). It was also recommended to change the stock.
A modified version of the carbine was submitted to the second set of trials on September 11, 1941. Five prototypes were manufactured by Inland (which would later produce M1 Carbines) in conjunction with Bendix. This second version had a total of 60 parts, and no longer had a provision for full automatic fire. It also lacked the pistol grip found on the first model and also now had a bolt handle directly connected to the bolt. The second variant was also heavier, at 5.8 pounds and was overall considered inferior to the first Hyde carbine. Functioning was not as good, field stripping was more difficult, and the barrel was inferior to the original rifle.