Mk4 300

An accurate "pistol" is worthless if it's not reliable and durable. TX Precision firearms are designed and built to withstand the most harsh conditions, extreme environments and are backed by a full transferable LIFETIME WARRANTY.

Upper Features:

  • Upper: TXP Gen. II Matched 7075 T-6
  • Barrel:  .300 Blackout                  1:7 Twist Rate

                  8"  4150 CMV Cryogenically Treated w/ Melonite Finish and Nickel               

                 Boron Coated extended M4 Feed Ramp Extension, Hanson Profile        

  • Handguard: 7" BCM MCMR M-Lok
  • Gas System: Direct Impingement
  • Charging Handle: Ambidextrous
  • Bolt Carrier Group:  8620 Steel, Black Nitride, SAE 9310 Steel Bolt

                 Nickel Boron*

  • Muzzle Device: A2 Flash Suppressor*

                  SilencerCo ASR Flashider (option + $50)                  

                  SilencerCo ASR Brake (option + $50)                  

                  Surefire SOCOM Flash Hider (option + $100)                  

                  Surefire SOCOM MB (option + $100)

Lower Features:

  • Lower: TXP Gen. II Matched 7075 T-6 w/ upper tension screw
  • Trigger: CMC 3.5lb Single Stage Curved *

                  CMC 3.5lb Single Stage Flat (option +  $0)

  • Safety/Fire Selector: Ambidextrous
  • Buffer Kit: JP Silent Captured Spring
  • "Pistol Brace": Magpul BTR *

                  Maxim Defense PDW Brace

  • Grip: MAGPUL MOE K2+ *
  • Magazine: (1) MAGPUL 30 Round PMAG®

Additional Features:

  • Rifle Case: 36" Drago Rifle Bag
  • Rifle Color: Black *

                  Desert (FDE) (option + $100)    

                  Custom (option + $150)       

Mk4 300 Accuracy Guarantee 

No TX Precision Mk4 300 "Pistol" can leave the facility unless it obtains Sub-MOA accuracy or better at 100 yards with factory match ammo. While we guarantee the rifle is capable of sub-MOA accuracy, we can not guarantee the end-user will be able to shoot sub-MOA since we have no control over shooting proficiency, familiarity with the system, ammunition choice, environmental factors, etc


Caliber:  .300 Blackout

Shipping to FFL Required:  YES

Made in America:  YES (Texas)

Barrel Length:  8"


We currently do not ship this product to the following states: California, Colorado, Connecticut, Hawaii, Illinois, Maryland, Massachusetts, New Jersey, New York and Washington D.C.