Description
5″ FM9 Monolithic style upper receiver, with A2 charging handle, MFT FM9 Lower receiver, with MFT grip and brace. Mag NOT Included. Accepts Glock Mags!
The Binary Firing System® GEN 3 (BFSIII®) is a 3-position trigger. In position 3 it fires one round on pull and one round on release, making this trigger ideal for both tactical and competition use. The BFSIII® provides greatly reduced split times between rounds, allowing for tighter groups.
TRIGGER OPERATION:
Position 1 – Safe –Will not fire
Position 2 – Semi – Fires 1 round per pull
Position 3 – Binary – Fires 1 round on pull and 1 round on release
FEATURES:
* Release round can be canceled by simply moving our Patent Pending selector out of Binary® mode while holding the trigger back
* Easy to install * Smooth trigger pull: 4.5 lbs, +/- 0.5 lbs
* Positive reset on release phase
* Enhanced buffer springs for optimal flexibility
* Works in most AR platforms and calibers including 5.56 NATO, 308 Win, 300 BLK, 9mm, Rimfire, etc….
* Compatible with most Bolt Carrier Groups (BCG)
* Great for competition shooters, tactical shooters, and recreational enthusiasts
*The AR-S1 trigger comes with the straight flat-faced trigger.
Warning:
- Not for civilian sales in CA, CT, DC, FL, HI, IA, MD, NJ, NY, RI, and WA
- In Delaware may only be used in pistol platforms.
- NEVER ALTER ANY INTERNAL COMPONENT OF THE BFS®.





