The Brownells exclusive FM Products FM-9 8.5” Complete 9x19mm Upper Receiver comes with an industry first “Tri Lug Barrel” standard. The compact Brownells Exclusive 8.5” Tri-Lug FM9 Upper comes with a 8.5” M-LOK compatible handguard and a 10.5” Tri-Lug Barrel.  This allows for the quick connect of many supressors, without having to get a muzzle adapter. 

The FM Products Upper is feature rich and cutting edge. Built from the ground up to provide outstanding reliability and accuracy with a host of top tier features. The traditional M4 charging handle has been replaced with an ambidextrous, non reciprocating forward charging handle. The monolithic style has been
achieved with a proprietary interlock between the upper and handguard. Lastly, the slim-line handguard is M-LOK compatible for your favorite accessories.

• Includes M-LOK compatible Handguard
• Feature an Ultra Light PCC barrel
• 10.5” Tri Lug Barrel, made from 41V50
• Inside Diameter of handguard is 1.3”
• Features 10.5" Ultra Light Barrel with a 8.5" Handguard for an ultra compact upper
• Made in the USA
• Type 3 Hard Anodize finish
• Manufactured with ISO:9001 and AS:9100 quality certifications
• Allows for quick connect of many supressors with no adaptor. 
• Ambidextrous para-style folding forward charging handle
• Limited lifetime warranty through Foxtrot Mike Products
• Complete upper includes Ultra Premium Bolt Carrier Group
• For Glock®

Foxtrot Mike Products FM9 Upper Receivers are not compatible with Korean magazines.