AR Lower Parts Archives - AdVance Armament

FORTIS END PLATE & CASTLE NUT

Thu, 23 Apr 2026 01:27:42 +0000

The Fortis Standard Castle Nut is manufactured from a solid piece of billet aircraft grade aluminum that offers a significant weight reduction to your castle nut. If you’re trying to save ounces, this is a great way, but without sacrificing durability. The castle nut will fit onto mil-spec buffer tubes and quickly upgrade the form and function of your build. Fortis QD End Plate features the quick detach swivel socket and is designed for carbine style buffer tubes for the AR15 & 308 platforms.

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KDG FN SCAR STOCK BLACK

Tue, 21 Apr 2026 18:13:45 +0000

KDG FN SCAR STOCK BLACK

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ESD GRANITE GRIP BVRTAIL COARSE FDE

Mon, 20 Apr 2026 18:08:50 +0000

ESD GRANITE GRIP BVRTAIL COARSE FDE

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KAK FIELD REPAIR KIT 5.56 AR-15

Mon, 20 Apr 2026 17:07:02 +0000

KAK FIELD REPAIR KIT 5.56 AR-15

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FORTIS MAG CATCH & BUTTON COMBO ODG

Mon, 20 Apr 2026 17:06:57 +0000

The Fortis Billet Mag Catch & Button is a superior alternative to the ones found in a mil-spec lower parts kit. Easily installs in seconds and instantly upgrades your rifle. This upgrade is CNC machined from a solid piece of 6061-T6 aircraft grade aluminum or 303 Stainless Steel. There is an added texture and engraved logo for just the right touch of function and styling. Magazine rod is 303 Stainless Steel for further added durability.

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FORTIS K2 ENHANCED END PLATE ODG

Mon, 20 Apr 2026 17:06:55 +0000

When designing the new Lightweight Enhanced (LE) Castle Nut & End Plate System, Fortis came up with two systems that virtually eliminates the risk of your castle nut ever backing out. With the two lockdown systems (K1 & K2), they’ve engineered a solution to install the castle nut onto the end plate that is not only robust, but also stands true to the brand of innovation and ingenuity. The K2 system utilizes a locking lever design that seats itself through a designed slot on the bottom of the end plate and into corresponding cutouts on the castle nut. This ultra precision fit allows the castle nut to seat itself into place without the need of staking the end plate. No set screws, no backing out and no failures. All of these features at only .53 oz / 15 grams!

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FORTIS K1 ENHANCD AR15 END PLATE FDE

Mon, 20 Apr 2026 17:06:51 +0000

When designing their new Lightweight Enhanced (LE) Castle Nut & End Plate System, Fortis came up with two systems that virtually eliminates the risk of your castle nut ever backing out. With two lockdown systems (K1 & K2), Fortis has engineered a solution to install the castle nut onto the end plate that is not only robust, but also stands true to their brand of innovation and ingenuity. The K1 system features a tapered castle nut that seals itself onto the end plate. This ultra precision snug fit allows the castle nut to seat and seal itself into place without the need of staking the end plate. No ratcheting, no set screws, no backing out and no failures. All of these features at only .59 oz / 16.8 grams!

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FORTIS K1 ENHANCD AR15 END PLATE GRY

Mon, 20 Apr 2026 17:06:50 +0000

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SOLGW CASTLE NUT

Mon, 20 Apr 2026 17:06:22 +0000

Sons of Liberty Gun Works is a manufacturer of quality firearms and parts, perfect for your next build, next competition, or next line of defense. Their small parts fit most mil-spec firearms.

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FORTIS TORQUE PISTOL GRIP CF BLUE

Sun, 19 Apr 2026 18:06:52 +0000

Fortis Manufacturing’s Torque Pistol Grip is a lightweight skeletonized grip that makes use of modern materials and manufacturing to produce a functional, high performance product. Construction is skeletonized anodized aluminum with carbon fiber front and back strap inserts.

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