M40 (disambiguation)

M40 can refer to:

• M40 Sniper Rifle, a US Marine Corps bolt-action sniper rifle.

M40 sniper rifle 7.62x51mm NATO

• Smith & Wesson M40, a Smith & Wesson revolver.

Smith & Wesson Model 40, .38 Special

• Steyr M40, a variant of the Steyr M chambered in .40 S&W.

Steyr M40-A1 .40 S&W

• M40 Recoilless Rifle

M40 Recoilless Rifle - 106mm