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Title:	RIFLE, MILITARY -  U.S. RIFLE M1 .280 SN# 2963441
Maker/Manufacturer:	GARAND, JOHN C.
Date of Manufacture:	06/01/1944
Eminent Figure:
Catalog Number:	SPAR 3506
Measurements:	OL:110.4CM 43 1/2" BL: 60.9CM 24"

Object Description:

U.S. RIFLE M1 .280 SN# 2963441
Manufactured by Springfield Armory, Springfield, Ma. in 1944 - Modified M1 gas-operated, semi-automatic rifle. 8-round "en bloc" clip fed. Barrel chambered and rifled for British .280 cartridge. Successfully tested at Aberdeen 19 September 1951. Test conclusions read in part: "It is concluded that on the basis of limited testing performed, the U.S. Rifle, Caliber .30, M1, can be modified to fire the British, Caliber .280 Ammunition by using a barrel rifled and chambered for this round and by enlargement of the barrel gas port diameter to .150". Further evaluation of the performance of the M1 Rifle converted to fire the British Caliber .280 round cannot be made without further testing with more rifles under adverse and endurance firing conditions."

Markings:
Receiver: U.S. RIFLE/CAL..30 M1/SPRINGFIELD/ARMORY/2963441.
Bolt: D28287-12SA/S-04.
Stock:E3 CHAMBER/.280 BORE.
Tag: BBL. PORT .081/T65E3 .280/H/S/1.564 T. M-1 RIFLE REBARRELED TO/T65E3 CASE/.280 CAL. 10/10/51 (SA T65E3 chamber) 3/21/52 - Test completed. .280 = 7.92mm Kurz. MODIFIED TO T65E3 CHAMBER, .280 BORE.

References:
Stevens, Blake. U.S. RIFLE M14 FROM JOHN GARAND TO THE M21. Collector Grade Publications Inc. Toronto, Canada. 1991.

See, SA-MR11-1059. Test determined that modification could be made.