ALEXANDER AR15 DIY 16″ UPPER – KIT 6.5 GRENDEL

The Alexander Arms 6.5 Grendel upper receiver kit delivers precision rifle building for shooters serious about mid-range performance. This 16-inch matte black barrel assembly ships as a complete DIY package, ready for your lower receiver. Whether you're in San Mateo or anywhere in California, understanding your build options starts with knowing local regulations—review California firearm laws before assembly.

6.5 Grendel Ballistics and Barrel Twist

The 1:8 twist rate stabilizes 6.5 Grendel projectiles from 90 to 130 grains, making this upper suitable for hunting, precision shooting, and long-range work. The 16-inch barrel balances velocity retention with maneuverability. At 20.35 inches overall length, this upper pairs with standard AR-15 lowers. For California shooters exploring compliant firearm options, browse our California-compliant handgun catalog as well. Grendel brass and ammunition availability has improved significantly in recent years. Browse our firearms dealer.

Frequently asked questions

What's the barrel material and finish on this Alexander upper?

The barrel is matte black finished steel, designed to resist corrosion during storage and field use. The finish is durable but not a hard-coat anodize; standard firearm maintenance applies.

Does this upper work with any AR-15 lower receiver?

Yes. This Grendel upper accepts standard AR-15 lower receivers via the mil-spec upper receiver extension. Ensure your lower is properly assembled and headspaced before firing.

Where is the closest FFL dealer to Santa Clara, Mountain View, or Palo Alto?

TacticCAL Gun Store in Sunnyvale is a short drive from Santa Clara, Mountain View, and Palo Alto, serving the South Bay as a full-service FFL dealer for transfers and DROS. Looking for gun store Los Gatos? Visit us in Sunnyvale.