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© Robert W. Seijas V2 10/10

The evolution of the M1 NM rifle is generally broken down into three major stages according to the chronological introduction of major improvements. The official National Match program terminated in 1963, and most NM rifles returned or still in inventory were reconditioned to 1963 standards.

Type 1 1953 – 1958
Intermediate 1959
Type 2 1960 – 1963

TYPE 1: (Generally identical to issue grade rifles in appearance)

a) Production New
Rebuilt
Total
1953 800 800
1954 1700 800 2500
1955 3003 314 3317
1956 5050 550 5600
1957 4184 499 4683
1958 1295 731 2026
b) Specially selected and assembled for match quality
c) Only non-standard marking is NM near muzzle
d) 1957 improvement: Front sight marked 062 available and installation by competitors permitted
e) 1958 major improvements: Gas cylinder ring reamed .006 larger
Front sight NM062 permitted
Aperture NM .595 and NM .520 permitted
f) Supply of new receivers exhausted

INTERMEDIATE: (First use of NM marked parts in original SA assembly)

a) Production New
Rebuilt Total
1959
2877