Thompson/Center Arms 10059 Compass Composite Bolt .223 REM/5.56

The FX-9 pistol has a familiar set of operating controls for the avid AR-15 user, it accepts AR-15 stocks / braces and buffer tube assemblies,as well as most free float AR-15 rail assemblies.
The FX-9 comes standard with a 33 rd double stack Glock style 9mm magazine. When we designed the FX-9 our goals were Reliability, Affordability, and familiar controls for the user.
The FX-9 is machined from billet material, anodized type III aluminum components . Steel components are full hard nitride and nickle boron nitrided including the barrel, bolt, ejector, last round hold open, feed ramp and extractor for extended wear properties and corrosion resistance.
The upper and lower receiver are more than 1.00″ shorter than a standard AR-15 upper and lower receiver making it more compact and lighter than a standard mil-spec AR-15 design.Specifications:

7.375″ Free float M Lock Rail With an 8.25 ” barrel
KAK Stabilizing Arm Brace
AR-15 Configured Rear charging handle, safety selector, last round bolt hold open, mag release, pistol grips(without rear tang)
3″ Muzzle Enhancer (suppressor look alike)
compatible with 9mm approved 1/2″x 28 T.P.I. muzzle devices and suppressors
compatible with KNS precision AR-15 trigger pins.