Details
Warden Duty 16 Inch .45 ACP AR-45 Upper Build Kit with Vertex Billet Upper and Keymod Handguard
16 inch 4150 Chrome Moly Vanadium blowback barrel in .45 ACP with 1:16 twist rate, government profile, phosphate finish, Vertex enhanced pistol caliber billet upper receiver made from 6061-T6 aluminum with Type III hard coat anodized finish, 15 inch freefloat Keymod handguard, and KAK Industry .45 ACP compensator. This upper build kit delivers pistol caliber carbine performance with the stopping power and subsonic characteristics of .45 ACP.
Key Features
- 16 inch .45 ACP blowback barrel made from 4150 Chrome Moly Vanadium with government profile, phosphate finish, and 1:16 twist rate optimized for subsonic .45 ACP projectiles
- Blowback operation eliminates the gas system entirely, using direct recoil energy to cycle the action for simplified maintenance and increased reliability
- Vertex enhanced pistol caliber billet upper receiver made from 6061-T6 aluminum with Type III hard coat anodized finish for superior wear resistance
- 15 inch freefloat Keymod handguard made from aluminum allows accessory mounting without affecting barrel harmonics
- KAK Industry .45 ACP compensator with .578x28 threads reduces muzzle rise and improves follow-up shot speed
- Pistol caliber design uses standard AR-15 lower receivers with dedicated .45 ACP magazines and blowback bolt carrier groups
Perfect For
- Pistol caliber carbine enthusiasts wanting .45 ACP stopping power in an AR platform
- Suppressor hosts where subsonic .45 ACP eliminates supersonic crack
- Close range applications where heavy slow projectiles deliver superior energy transfer
- Shooters who prefer simplified blowback operation without gas system tuning
16 Inch .45 ACP Blowback Barrel
The 16 inch barrel length provides full velocity extraction from .45 ACP while maintaining rifle classification and ensuring reliable feeding with the blowback operating system. The 1:16 twist rate is specifically optimized for the heavy subsonic projectiles used in .45 ACP, typically ranging from 185 to 230 grains. The government profile distributes weight from chamber to muzzle with a slight taper, maintaining rigidity while keeping overall weight reasonable. The phosphate finish protects against corrosion and provides a non-reflective surface. The blowback design means there is no gas port, gas block, or gas tube, the barrel uses direct recoil energy transferred to a heavy bolt carrier to cycle the action. This simplified operation reduces potential failure points and makes the system naturally suppressor-friendly without requiring gas adjustment.
Vertex Enhanced Pistol Caliber Billet Upper
The Vertex billet upper receiver is specifically designed for pistol caliber builds and machined from a solid block of 6061-T6 aluminum. The billet construction allows for enhanced features tailored to pistol caliber operation including optimized ejection port geometry and magazine well interface. The Type III hard coat anodized finish provides superior wear resistance compared to standard Type II anodizing, creating a harder surface that better resists scratches and abrasion from extended use. The enhanced design accommodates the unique requirements of blowback pistol caliber systems including different bolt carrier dimensions and ejection characteristics compared to standard direct impingement AR-15 uppers.
Keymod Handguard and KAK .45 ACP Compensator
The 15 inch freefloat Keymod handguard extends nearly to the muzzle device and allows you to attach lights, grips, and other accessories using Keymod compatible mounts. The freefloat design means the handguard does not contact the barrel, maintaining accuracy potential as the barrel heats. The lightweight aluminum construction keeps front end weight manageable, particularly important on blowback systems where reciprocating mass is already higher than gas-operated rifles. The KAK Industry .45 ACP compensator features .578x28 threads matched to the barrel and uses angled ports to redirect muzzle gases upward, counteracting muzzle rise. This improves control during rapid fire and speeds up sight recovery between shots. The compensator is particularly effective on blowback .45 ACP where felt recoil is more pronounced than standard 5.56 NATO.
Follow safe handling and manufacturer instructions. Ensure compliance with all applicable laws. BCG and charging handle are not included. Requires dedicated .45 ACP blowback bolt carrier group and .45 ACP magazines.
