Battlefield Ambience sound effects, royalty-free and cleared for commercial work. 3 libraries carry this tag, most of them filed under Guns and Explosions.
Recordists here also tag Pistol, gunshot and dry fire, which is worth a look if nothing below fits.
Musket, flintlock, and blunderbuss sound effects across 480 files, with field and naval cannon blasts, ramrod and powder-pouring foley, cannonball impacts on water, wood and stone, and battlefield ambience.
This sound library provides pistol sound effects recorded from Glock 17 and 23 handguns. Includes authentic gunshots, mechanics, bullet/shell sounds, and designed weapon variations at 96kHz/24-bit.
Sci-fi weapon sound effects covering over 50 blasters, pistols, shotguns, cannons and rifles with single, burst and looped fire, plus explosions, shields, reloads, bullet whiz-bys and battlefield ambiences.