Description

Project X  80% AR15 CNC Lower Receiver Black

What is Project X?

Our team has been modifying and improving their own personal Broken Arms lowers since 2011. Each revision bringing more comfort, reliability and style to your builds. No gimmicks, no toys.

Project X is our tenth revision, and brings the best we have to offer through years of real-world experience and your feedback.

Project X looks great with Magpul® PMAG magazines.

 

  • Hard black anodize type III (mil spec) DI sealed.
  • Mil-Spec broached magwell
  • Glass bead blasted.
  • 6-32 pin/screw for the bolt catch.   (replaces roll pin)
  • Added nylon tipped screw in rear of lower.   (removes slop between upper and lower after a lot of use)

 

 

Project X will work with these calibers:

Rimfire calibers

  • .17 Mach 2
  • .17 HMR[1]
  • .17 Winchester Super Magnum[1]
  • .22 Long Rifle[2]
  • .22 Winchester Magnum Rimfire[1]

Centerfire calibers inch measurement

  • .17 Mach IV
  • .17 Remington Fireball
  • .17 Remington
  • .17-223
  • .20 Practical
  • .204 Ruger
  • .222 Remington
  • .223 Remington
  • .22 PPC
  • .22 Nosler
  • .224 Valkyrie
  • .224 Kritzeck (Shortened .223 Remington neck)
  • .223 Winchester Super Short Magnum
  • .243 LBC
  • .243 Winchester Super Short Magnum
  • .25 Winchester Super Short Magnum
  • .25-45 Sharps
  • .277 Wolverine (6.8×39mm)
  • .30 Carbine
  • .30 Remington AR
  • 30 American
  • 300 OSSM
  • 300 AAC Blackout (7.62×35mm)
  • .300 Whisper
  • .350 Legend
  • 358 Yeti – Wildcat
  • 375 SOCOM
  • .40 S&W
  • .45 ACP
  • .450 Bushmaster
  • .458 SOCOM
  • .50 Action Express
  • .50 Beowulf

Centerfire calibers metric measurement

  • 5.45×39mm
  • 5.56×45mm NATO
  • FN 5.7×28mm
  • 6×45mm
  • 6.5mm Grendel
  • 6.8×39mm (.277 Wolverine)
  • 6.8mm Remington SPC
  • 7.62×37mm Musang
  • 7.62×39mm
  • 7.62×40mm Wilson Tactical
  • 7.92x33mm Kurz
  • 9mm Parabellum
  • 10mm Auto
  • 9x39mm