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Hi Weslie, Yes the Glock 21 is slim grip. The width is 32.50 mm / 1.27 in. https://www.budsgunshop.com/catalog/product_info.php/products_id/411548960/New+Glock+21+FDE+Gen+4+45acp

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The Gen 4 21 has the same frame as the old "SF" model, the backstraps allow you to make it bigger if needed.

LENGTH: 209 mm / 8.22 in. WIDTH: 32.50 mm / 1.27 in. LENGTH BETWEEN SIGHTS: 172 mm / 6.77 in. HEIGHT: 139 mm / 5.47 in. BARREL HEIGHT: 32 mm / 1.26 in. BARREL LENGTH: 117 mm / 4.60 in.

Wesley, The Modular Back Strap design on the G21 Gen4 lets you instantly customize its grip to adapt to an individual shooter's hand size. https://www.budsgunshop.com/catalog/product_info.php/products_id/411548960/New+Glock+21+FDE+Gen+4+45acp

Yes the Glock 21 is slim grip. The width is 32.50 mm / 1.27 in. LENGTH: 209 mm / 8.22 in. WIDTH: 32.50 mm / 1.27 in. LENGTH BETWEEN SIGHTS: 172 mm / 6.77 in. HEIGHT: 139 mm / 5.47 in. BARREL HEIGHT: 32 mm / 1.26 in. BARREL LENGTH: 117 mm / 4.60 in. budsgunshop.com/catalog/product_info.php/products_id/411548960/New+Glock+21+FDE+Gen+4+45acp The Full dimensions can be found here - https://thegunparlor.com/product/fde-glock-g21