Easily one of the most iconic pistol calibers in the world with more than a century of faithful use, .45 ACP has been a go-to choice for shooters looking for a proven, heavy-hitting round. Not only does the MkG RESOLUTE come chambered in this caliber, but it also makes use of commonly found and trusted Glock-pattern .45 ACP magazines and spurred the invention of our legendary Radial Delayed Blowback operating system. Features EML handguard, full length M-LOK slots on both sides and the bottom of the handguard as well as M-LOK between the top picatinny rail sections; ZEROED parts including: pistol grip, drop-in trigger, 60/90 degree ambi safety, ambi charging handle, bolt catch, polymer dust cover and muzzle brake. Includes Glock 13rd magazine.