The Librarian’s Key w/ Gauntlet Arms Brace is a compact and robust full build kit for the AR-15 platform chambered in .45 ACP. Featuring a 7.5-inch barrel constructed from 4150 CrMoV steel, the barrel has a 1:16 twist rate and a government profile, all finished with a durable parkerized coating. The blowback gas system is complemented by a KAK Industry .45 ACP compensator. The upper receiver is made from billet 6061-T6 aluminum with a Type III hardcoat anodized finish, ensuring structural integrity.
The kit includes a 7-inch free float M-Lok handguard in black for versatile accessory attachment. The bolt carrier group is crafted from 9310 alloy steel, finished with nitride for durability. The Gauntlet Arms polymer stabilizing brace provides stability and comfort, mounted on a heavy-duty pistol buffer tube. This kit combines quality components for gunsmiths who appreciate reliability in their builds.
Caliber: .45 ACP
Barrel Length: 7.5 inches
Barrel Material: 4150 CrMoV Steel
Barrel Twist Rate: 1:16
Barrel Finish: Parkerized
Barrel Profile: Government
Barrel Thread Pitch: .578x28
Barrel Gas System: Blowback
Muzzle Device: KAK Industry .45 ACP Compensator
Muzzle Device Thread Pitch: .578x28
Upper Receiver Material: Billet 6061-T6 Aluminum
Upper Receiver Finish: Type III Hardcoat Anodized
Handguard Name: 7-inch M-Lok Handguard
Handguard Color: Black
Handguard Style: Free Float
Bolt Carrier Material: 9310 Alloy Steel
Bolt Carrier Finish: Nitride
Charging Handle: AR-15 M4 Charging Handle Mil-Spec Quality
Charging Handle Material: Aluminum
Brace Information: Gauntlet Arms Polymer Stabilizing Brace
Pistol Brace Material: High-Strength Polymer
Pistol Brace Color: Black
Buffer Tube Kit: Heavy Duty Pistol Buffer Tube for AR-15
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