57MM AT GUN - LEG SEGMENTS (LANDING LEGS) SET OF 2 - - REPRODUCED

57MM AT GUN - LEG SEGMENTS (LANDING LEGS) SET OF 2 --  REPRODUCED
From Originals. Very close Authentically to Original

INFORMATION ABOUT 57mm AT GUN:

57 MM ANTITANK GUN MI-CARRIAGEMIA3-(BRITISH) SUBSTITUTE STANDARD

British battle experience indicated the need for a light gun more powerful than the 2-pounder (37 mm) 
which could be employed as an antitank weapon or be mounted in a tank or gun motor carriage. This 
requirement was met by the 6-pounder gun, standardized in America for Lend-Lease manufacture as the 
57 mm Gun, M1.
O.C.M, 16489, dated 20 February 1941, authorized the preparation of drawings of the British 8-pounder
gun, carriage and on-carriage fire control equipment converted to American gears, threads and 
tolerances. On 1.5 May 1941, O.C.M. 16722 recommended standardization of the British-American 57 mm 
materiel as Gun, M1, Carriage, M1, Telescope, M18, and Telescope Mount, M24.
Modifications were made to the M1 Carriage which culminated in the present Carriage. M1A3. These 
changes included substitution of free traverse for gear traverse, and new lunette, drawbar, and trail 
lock assemblies.

Ammunition

Ammunition for the 57 mm, M1, Gun is in the form of fixed rounds. It consists of A.P. Projectile, M70.

PRINCIPAL CHARACTERISTICS

GUN, M1

Weight of gun........................755 lb. 
Overall length ............... ........ 117 ins.
Length of bore.......................50 cab. 
Muzzle velocity ........... .......... 2,700 f./s. 
Volume of chamber ............ ...100 cu. ins. 
Travel of projectile in bore..............96 ins.
Maximum powder pressure.....46,000 lb./sq. in. 
Breech mechanism........Vertical sliding wedge 
Rate of fire (approximate)..........30 rds./min. 
Rifling ........... Right-hand, 1 turn in 30 cals. 
Range ........................ ...10,260 yd,.

RECOIL MECHANISM, M1

Type. ........................... Hydrospring 
Weight, with slipper ..... . ...... .... ... 373 lb. 
Normal recoil (-1 in. + 1/a in.) ....... 2934 Ins. 
Maximum recoil .................. ...31% ins.

CARRIAGE, M1A3

Total weight without gun.. I .......... 1,945 lb.
Height of lunette (limbered position) .... ..22 Ins.
Length of carriage (muzzle to lunett,). .200% ins. 
Width over hub caps. . ................ .75 ins.
Height (traveling position) .... .......... 50 ins. 
Trail spread (maximum) (included angle)..... 90°
Elevation (maximum), carriage In
firing position... .......................15° 
Depression (maximum), carriage in
firing position ..... ....................-5°
Traverse (maximum, right) .................. 45°
Traverse (maximum, left) ................... 45°
Width of tread (c/I—c/I of wheels).....57.7 ins.

AMMUNITION

Weight of complete round A.P., Mb. ..12.56 lb. 
Weight of projectile 
(target practice or armor piercing)..................6.28 lb. 
Weight of powder charge
(approximate) ................ ......2.25 lb. 
Type of ammunition ....................Fixed
Armor penetration—homogeneous plate
20° from normal— 500 yds..........3.4 ins. 
1,000 yds..........2.7 ins.
2,000 yds. . ...... ..1.9 ins.

Sighting and Fire Control Equipment

On Carriage Equipment

Telescope, M18 Telescope Mount, M24A1

Off Carriage Equipment

Gunner's Quadrant, M1

REFERENCES—TM 9-2005, v. 5; TM 9-303,TM 9-1303

JANUARY 1944