Sylvan Arms GCB100 Glock conversion block drops into a mil‑spec AR lower to accept Glock-style 9mm magazines, enabling pistol-caliber carbine builds and range/competition PCC setups.
The Sylvan Arms GCB100 Glock Conversion Block provides a drop-in magwell insert that allows a standard mil‑spec AR lower to accept Glock-style 9mm magazines when paired with compatible 9mm AR uppers. Installation is designed to follow the fit and operation of a typical magazine well and features a trigger-style magazine release for one-handed magazine removal. This part is intended for pistol-caliber carbine conversions, range training, and competition-style PCC applications.
Product Specifications
The manufacturer is Sylvan Arms.
The manufacturer part number is GCB100.
The UPC is 852237007907.
The caliber is listed as 9mm.
The part is designed to fit AR-15 lowers.
The finish is listed as Anodized.
The color is Black.
The model is listed as Magwell.
The size is listed as Mil-Spec.
The units per box are 1.
The weight is listed as 0.35 (unit not specified by source).
The material information is see notes.
The frame material information is see notes.
The subcategory is Handgun Parts.
The GCB100 offers a straightforward solution for builders who want to convert a mil‑spec AR lower to accept Glock magazines without purchasing a dedicated pistol-caliber lower. Its drop-in design and trigger-style magazine release make it practical for use in competition PCC classes or extended range sessions where Glock magazines are preferred. Constructed and supplied with a focus on fit for mil‑spec lowers, it is a simple component to add to a pistol-caliber carbine project.
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