CMMG 10-Round Extension for FN 5.7x28mm – Fits 20-Round Magazines

The CMMG 10-Round Extension converts standard 20-round FN 5.7x28mm magazines into 30-round capacity magazines, providing extended firepower for compatible CMMG AR-15 platform firearms chambered in 5.7x28mm.

• Part Type: Magazine Extension
• Compatible Firearms: CMMG AR-15 platform firearms chambered in FN 5.7x28mm
• Compatible Magazines: 20-round FN 5.7x28mm magazines
• Capacity Increase: +10 rounds (20rd to 30rd total)
• Material: Polymer
• Installation: User-installable with basic tools; magazine disassembly required
• Includes: Extension body and necessary components