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20" 5.56x 42(SPC) 3R, FLUTED
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Think of this as the 224 Valkyrie improved - Wildcat based on the 6.8 brass trimmed to 42mm, apx 250fps faster than a 5.56 and 150 fps faster than the Valkyrie.  75-80gr bullets run 3000-3100 out of a 20" barrel. The 5.56x42 was designed around 2007 or 2008 long before the 22 Nosler or 224 Valkyrie. It was designed to shoot the 75-80gr Amax and Berger at mag length but also shoots varmint bullets as light as 40gr. 55gr bullets run around 34-3450fps.

6.8 small base bushing dies can be used to form and load the 5.56x42 or Whidden Gunworks in Ga can make a custom set for you. 224 Valkyrie dies can be used for the initial neck down in one step if the die is held up off the shell holder and adjusted so the neck is sized down without touching the shoulder.

NOTICE- This barrel has 5/8-24 muzzle threads to reduce bore swelling at the muzzle common with barrels threaded 1/2-28. Most barrels with 1/2" muzzle threads will allow bullets to wobble when exiting the muzzle which degrades accuracy.

Jason Peterson shot a 4.5" group at 1000 yards using 28gr N540 with the 80gr Amax.

Barrel extension must be installed after the flutes are cut. The flutes will NOT be clocked straight up.

  • Chamber: 5.56x42(6.8 based wildcat)
  • Profile: SPR midweight-.850/.750/.718
  • Fluted: 8 straight flutes
  • Barrel Length: 20"
  • Twist Rate: 1:7.7- Hybrid 3R rifling
  • Gas System: rifle Length
  • Diameter at Gas Port: .750"
  • Muzzle Thread Pitch: 5/8-24
  • Material: 4150 Chrome Moly Vanadium Steel
  • Finish: Melonite
  • Process: Button Rifled
  • Barrel Lining: Melonite
  • Barrel Extension: M4
  • Assembly: Stripped
  • Weight: 2lb 12oz
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    This business supports AMERICA and its Constitution

    We're in business for the Deplorables, Patriots, Infidels, protectors of the US Constitution, flag and President. We applaud the 50% who refused to let the democratic terrorist destroy this country. 

    (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
    Sorry we do not export anything and do not have a storefront. Everything must be purchased online.

    6.8 SPC II, 5.56, 223 wylde, 6.5 Grendel, 224 Valkyrie, 270-08, 30 Herrett, TAC 6, 224 Predator, 6mm Predator, 277 WLV,  224 Grendel, 6mm Grendel, 6.5 Creedmoor, 5.56 x 42,

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