The Sylvan Arms 9mm conversion block lets a standard mil-spec AR lower run Glock 17 and Glock 19 pattern 9mm magazines. Slide the block into the magazine well of your AR lower, pair it with a compatible 9mm AR upper, and you have a pistol caliber carbine that shares magazines with your Glock.
The block is machined from aircraft-grade 6061 aluminum and finished in black. A trigger-style magazine release makes one-handed magazine removal easy, so reloads stay quick without changing how you hold the rifle.
Features:
Using a Glock-pattern block lets one stock of magazines feed both your pistol and your carbine, which simplifies range trips and keeps the build cost down compared with a dedicated 9mm lower.
Before ordering: confirm that your 9mm upper and bolt are set up for Glock-pattern magazines. After installing, function-check feeding, extraction and magazine release with dummy rounds first, then with live ammunition at the range.
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