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PWS MK109 MOD2 Upper 300BLK
PWS MK109 MOD2 Upper 300BLK
 
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MSRP: $1,499.00

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Product Code: MK1-M2U-300BLK-9
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Description
 
The Primary Weapons MK109 MOD2 300 Blackout upper features no forward assist, MLOK handguard with integrated Picatinny rail sections, FRC suppressor-ready compensator, 9.75" barrel, long-stroke piston system, adjustable gas block & Radian charging handle.

PWS advises the use of supersonic 110 to 130 grain ammo on this platform. Running ammunition heavier than 130 grain can adversely affect cycling unless a suppressor is utilized.
Technical Specs
  • Fits milspec AR15 lowers
  • Caliber 300 Blackout
  • 3lb 7oz in weight
  • Lightweight upper receiver
  • Eliminated forward assist
  • 9.75 inch 41V50 FNC LIFE HD barrel
  • 1:6 twist threaded 5/8X24
  • FRC 2-port suppressor-ready compensator
  • Compatible with Rearden suppressor mounts
  • 8.9 inch MLOK handguard
  • Integrated front Picatinny rail sections
  • Pistol-length long-stroke piston system
  • 3-position adjustable gas block
  • Radian Raptor LT charging handle
  • Limited lifetime warranty

Average Customer Review: Average Customer Review: 5 of 5 5 of 5 Total Reviews: 45  Write a review.

  0 of 0 people found the following review helpful:
 
5 of 5 Best PWS dealer I've found September 6, 2025
Reviewer: Customer from Las Vegas, NV  
Very good experience with best price available, and fast shipping. Even better than buying from PWS, lol!

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  0 of 0 people found the following review helpful:
 
5 of 5 Mk109 Mod 2 September 1, 2025
Reviewer: Nathan from OR, USA  
Although I haven't had the chance to shoot and zero in this upper, I'm writing this review related to my experience with Mike. He was very clear and concise with me, a pleasure to communicate with, and got me taken care of in a personalized manner which I really appreciate. I will be purchasing all my PWS from Fortress Tactical from here on out. Its been a pleasure doing business with Mike!

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  0 of 0 people found the following review helpful:
 
5 of 5 Don’t buy PWS anywhere else August 7, 2025
Reviewer: Mike from MS, USA  
Mike @ Fortress Tactical is the only place I’ll buy PWS from. He is quick to answer your questions and ships very quickly. This is my 3rd big PWS item I’ve bought from him, but probably not the last. Highly, highly recommended

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  0 of 0 people found the following review helpful:
 
5 of 5 Upper June 13, 2025
Reviewer: Ed Melberg from Harmony, PA  
Upper is perfect for pistol, but why can it not be purchased just like the 223 pistol version? It don't make any sense to me.

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  0 of 0 people found the following review helpful:
 
5 of 5 Highly Recommend February 13, 2025
Reviewer: Lennard Harrison from Clermont, FL  
Delivery was faster than expected. Mike was very attentive to my questions/emails/texts. Will be doing all of my PWS business with Fortress!

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