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20" 270MSR fluted barrel and bolt
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In the photo 223, 6.8, 270 MSR

The 270MSR is a AR15 wildcat that was designed for the great selection of 130gr 270 hunting bullets. It will push 130gr bullets to 2700-2750fps out of a 20" barrel, apx 200fps faster than the 6.8 and 300 fps faster than the Grendel.   It is close to a full power hunting cartridge, like the 260 or 308 but fits in an AR15. The 270MSR will add range to the 6.8s ability. It will be effective on mule deer, antelope. elk, and other med sized game usually shot at longer ranges than white tails and hogs.  68forums will be the place to go for performance info from guys that have been shooting the 270AR(predecessor to the 270MSR)for the last 5-6 years.

Norma Dasher brass should handle 60000psi and last longer than Lapua. Case capacity is around 42gr.
  Barrels ported to run with a standard CAR buffer and spring. Includes the new 750XD bolt(.742" nominal dia) and  matching extension.  You can use any standard AR15 receiver and carrier.

Custom Hornady dies and Norma 6mm Dasher brass are an option below.

Sorry but shipping will be slow on these, the bolt parts needed to finish the 750XD are 7 days out.

Also no coupons on this, they stuck me pretty hard on the fluting.

  • Chamber: 270MSR -.277cal  wildcat based on the Norma Dasher case.
  • Profile:  -.850/.750/.700
  • Fluted: Yes-8 straight
  • Barrel Length: 20"
  • Twist Rate: 1:10- Hybrid 3R rifling
  • Gas System: RIFLE Length
  • Diameter at Gas Port: .750"
  • Muzle Thread Pitch: 5/8x24
  • Material: 4150 Chrome Moly Vanadium Steel
  • Finish: Melonite
  • Process: Button Rifled
  • Barrel Lining: Melonite
  • Barrel Extension: M4-750XD bolt
  • Weight: 2lb 5oz

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Hornady Custom Dies
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    DO NOT USE  bullets that are larger than .277" in these barrels, the chambers were designed for .277" bullets and all 6.8 barrels have a .277" bore so bullets larger than .277 will cause excess pressure and increased copper fouling.  It seems some Maker bullets and Cavity Back bullets made by Maker are .278" and on top of that they are solid copper so check the diameter of the bullets before using them.


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     AR Performance (ARP)

    Morristown Tennessee 37814

    Hi performance 5.56 & 6.8 SPC barrels and parts since 2007

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