FAQ

FM PRODUCTS 9MM UPPER ASSEMBLY MANUAL
FM PRODUCTS 5.56 UPPER ASSEMBLY MANUAL
FOXTROT MIKE FM-9 Lower, how to remove magazine catch

What is the inner diameter for your handguard?

Inner diameter of a handguard is 1.3″

 

FOXTROT MIKE FM-9 Lower, how to remove last round bolt hold open (LRBHO)

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

 

quick install instructions for removing safety selector, to install drop in trigger
1) remove left side selector paddle by removing screw.
2) slide selector to right so you can access the c clip.
3) grab the c clip with some needle nose pliers (bent needle nose work best)
4) pull up on c clip while rotating safety (helps get c clip out of groove)
5) slide out safety to the right
6) install drop in trigger
7) slide safety in far enough that you can see the groove the c clop lives in.
8) slide c clip in groove while holding the c clip with needle nose and pushing down, rotating the safety helps get it started into the groove
9) there is a tab on the c clip that lives in a pocket in the lower receiver, make sure the tab is pointed towards the pocket in the lower, and it is in the 12:00 position
10) slide sector all the way to the left, then install left side sector paddle
foxtrot mike and stern defense fix - fm9 sidecharger with mag block

a Stern AD9 adapter and a FM9 complete upper fitment issues between the two items:

“Directions of the stern block is to pull it down and set the screws.

Try installing the block after the upper is in place and bolt is in forward position before the magblock install. The block being too high is going to cause you to hit your mag catch because its being pushed up, hitting the ejector or feed ramp because its too high, tons of issues.”