F&D Defense FD308 -Through innovation and design, F&D has created the best AR10 in the world, the FD308. The FD308 offers the shooter every possible advantage to get the most from their rifle. From fit to finish, reliability of performance, and out of the box accuracy, the FD308 is the apex in AR refinement.

F&D Defense FD308 Quick Specs:

  • 308 Winchester, match chambered; 5/8″-24 muzzle threads
  • 416 stainless Bartlein 5R cut-rifled barrel
  • Sub 1 MOA guarantee, Sub 3/8 MOA capable
  • 18″ & 22″ barrel length configurations; 1:10 twist; lapped & polished bore
  • Exclusive precision action components
  • Patent pending high-efficiency gas-piston system
  • Non-reciprocating side charging handle
  • Matched Lower, Upper, Rail, Bolt and Extension
  • Geissele SSAe and High-Speed National Match Trigger options
  • Magpul 20 round Pmag magazine
  • See the Design & Technical pages for additional info
  • Lifetime Warranty
  • FD308-18″ Price: $3395
  • FD308-22″ Price: $3495
  • Ordering Info
  • See FD260 variation specs
  • See FD65C variation specs

Factory-Load Range Report:

Independent Range Reporting done at Poco Loco Ranch, Boerne, Texas, 14Jan2012:
  • Model: FD308-17
  • Distance: 100yds
  • Setup: front bipod, rear bead-bag
  • Wind: calm-5 mph
  • Best Grouping Ammo: Blackhills 175gr BTHP Win Match, Factory New
  • Best Group: .175 MOA
  • Avg. Group: .443 MOA (testing various ammo makes & types)
Special thanks to Don Hardy and group!
Note: While F&D personel regularly shoot sub-half MOA groups during testing and evaluation of production rifles, F&D only posts on this website pictures of groupings and test targets from independant sources.

Detailed Specs:

Upper & Lower Receivers

  • F&D Receivers are manufactured to the most specific set of tolerances in the defense industry; F&D utilizes tolerance stack-up engineering software and advanced inspection systems. F&D maintains pride in stating that it unequivocally manufactures the finest  auto-loading rifle components in the world.


  • F&D’s custom-supplied, hand-forged 7075-T652 is the highest strength aluminum alloy available; up to 20% increased tensile strength from non-forged 7075-T6.  Receivers are match pinned for a perfect fit, not too tight or too loose.


  • Hardcoat Anodized IAW: MIL-A-8625, Type III Class 2


  • Flawlessly feeds from Magpul P20 magazines
  • 20 MOA tilt on top rail adds scope range
  • Side charging handle, non-reciprocating


  • 308 Winchester Match chambered, 5R cut rifled by Bartlien Barrels
  • 1:10 twist; 5/8″-24 threads
  • 18″ length: effective range up to 800 yards
  • 22″ length: effective range up to 1000 yards
  • Sub-MOA accuracy
  • 416 Stainless, more uniform grain and density than mass-produced hammer-forged 4140 & 4150 alloy steels
  • Heat treated, lapped, and polished bore


  • F&D’s rail system eliminates the barrel nut, allowing simplified and consistent barrel removal and reinstallation, while providing an extremely rigid connection to the upper receiver. F&D’s exclusive bolt-on interface maintains much higher rigidity than barrel-nut designs, and consolidates the absolute lowest and most compact rail-height available compared to any piston or direct impengement rifle system. This proprietary interface exerts 8200lbs of axial force against the upper receiver, compared to 6700lbs with standard barrel nuts utilized on most other AR-10 style rifles. Radial-clamping “quick-change” barrel systems exert little to no axial force against the upper receiver and reduces accuracy consistency. Axial barrel retaining force is one of the most significant structural contributors to accuracy and consistency on AR platform rifles.


  • Geissele Trigger models: SSAe, Match, DMR, & Service
  • Ambidextrous safety selector
  • Magpul UBR stock on 18″
  • Magpul PRS stock on 22″