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12.5" 5.56 3R SBR/pistol barrel- 1/2-28
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For pistol or legal SBR use only. Builder is responsible for building a legal firearm.

Many in the  spec ops think the M4 14.5 barrels are too long for use with a suppressor.  They also think they lose too much velocity with the MK18 10" barrels. These 12.5" barrels were our answer. These barrels have a mid gas system to help cut down on problems associated with carbine length gas systems and suppressors.  For NFA -SBR critical measurement use 13".
All barrels ship flat rate $15

Please READ - The chamber in these barrels will shoot 223 or 5.56 ammo. It will be more accurate than a 223 Wylde with mag length ammo especially MK262.  

  • Chamber: 5.56 CLE
  • Profile: lightweight- .700/.750/.700
  • Fluted: No
  • Barrel Length: 12.5"
  • Twist Rate: 1:8- Hybrid 3R rifling
  • Gas System: MID  Length
  • Diameter at Gas Port: .750" 1.1" long boss
  • Muzzle Thread Pitch: 1/2-28
  • Material: 4150 Chrome Moly Vanadium Steel
  • Finish: Melonite
  • Process: Button Rifled
  • Barrel Lining: Melonite
  • Barrel Extension: M4
  • Assembly: Stripped
  • Weight: 1lb 7oz
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    (ARP) AR15 Performance LLC

    Key West, FL 33040

    Hi performance 5.56 & 6.8 SPC barrels and parts since 2007

    The best way to contact is by email

    Phone: 801-750-4216  8am-5pm eastern time  M- Fri only
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