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The Hardened Arms LLC 6.8 SPC II upper delivers more energy than the 5.56mm NATO with kinetic energy that is anywhere from 40-50% greater at shorter ranges; up to 35% out to 600 yards. The 6.8 mm SPC II is more controllable in rapid fire, and lighter, allowing operators to carry more ammunition than would otherwise be possible with the larger caliber rounds.

The 6.8 SPC II was designed to be a longer range cartridge; for muzzle energy and long distance performance, the 6.8 SPC II is the clear winner. Often referred to as the 300 blackouts big brother is a field tested and battle proven cartridge with a huge following that can put game down at longer distances.

The 6.8 SPC II upper receiver will fit AR15 milspec lowers, it uses a 6.8 SPCII bolt and specific 6.8 mags. Hardened Arms LLC builds all 6.8 SPC II products to SAMMI Spec.
515 Tucker Ave Friday Harbor, WA 98250 |
Phone: 425-530-0837