FAQ

FOXTROT MIKE FM-9 Upper Receiver and Bolt Carrier MAINTENANCE AND CLEANING

how to swap the charging handle on a FOXTROT MIKE FM-9 Upper Receiver
SPIKES GLOCK STYLE LOWER EJECTOR MODIFICATION
QUARTER CIRCLE 10 LOWER EJECTOR MODIFICATION
a barrel nut torque
Hand tighten the barrel nut, slide handguard over the nut to see how far to turn it to align the holes between the handguard and barrel but.
Slowly tighten the nut a little at a time using a 1 1/4” box wrench making sure you don’t go part the next set if holes
Once the holes are aligned between the barrel nut and hand guard, apply loctote to the 8 socket head cap screws and tighten until they are snug using an Allen wrench
inner sizes of handguards

The inner size of a handguard is 1.3”

buffer spring recommendations
We have one for sale as a kit on Brownells
We use a stainless steel music wire heavy duty .308 spring