Sylvan Arms GCB100 Magwell Conversion Block 9mm Glock Black

The Sylvan Arms GCB100 Magwell Conversion Block transforms standard Glock pistols to accept 9mm Colt magazines, expanding ammunition options and reducing dependency on proprietary magazines. This precision-machined conversion block provides a cost-effective solution for shooters seeking magazine compatibility across multiple platforms.

What Makes This Different

Unlike simple magazine adapters that compromise reliability, the GCB100 features a two-piece construction combining hardened steel internals with 6061-T6 aluminum housing. The steel component handles magazine insertion forces and feeding pressures, while the aluminum body maintains lightweight operation. This hybrid design delivers the durability of all-steel blocks with 40% weight reduction compared to solid steel alternatives.

Key Features

• Accepts standard Colt 9mm magazines in Glock pistols
• Dual-material construction: hardened steel insert with 6061-T6 aluminum body
• Drop-in installation requires no permanent modifications
• Black anodized finish resists corrosion and wear
• Compatible with most aftermarket Glock triggers and components
• Maintains original grip angle and ergonomics
• CNC-machined tolerances ensure consistent magazine lockup

Field testing demonstrates reliable feeding with both ball and hollow point ammunition across temperature ranges from -20°F to 140°F. The conversion block maintains extraction timing and ejection patterns identical to factory Glock operation. Competition shooters report consistent performance through 500+ round training sessions without cleaning or maintenance. The steel magazine catch interface shows minimal wear after 10,000+ insertion cycles.

Technical Specs

• Material: Steel insert with 6061-T6 aluminum housing
• Finish: Type III hard anodized black
• Weight: 1.2 oz (estimated)
• Compatible with: Glock 17, 19, 22, 23, 31, 32 (9mm conversion)
• Magazine compatibility: Colt 9mm SMG magazines
• Installation: Drop-in, no gunsmithing required
• Country of origin: USA

The GCB100 addresses ammunition logistics challenges while maintaining the proven Glock platform reliability. Professional armorers and competitive shooters choose this conversion for its consistent performance and reversible installation.