Seekins Precision 8" NX8 300 BLK 1:7 Pistol Length HBAR Complete AR-15 Upper - 7" NOXs M-LOK Rail

Manufactured by Seekins Precision
SKU: PA0011100089
MPN: 11100089
Manufactured by Seekins Precision
1 Review

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Proof that the American Dream is alive and well, Seekins Precision began in 2004 with a single product. Their rapid growth has carried them from the early days of manufacturing scope rings to include more than ten major product lines, including complete rifles.

The NX8 Complete Upper Receiver is CNC machined from a solid billet of 7075-T6 aluminum, to exceed MIL-SPEC requirements. Chambered in 300 BLK, this upper can be finely tuned using the included Seekins Precision Adjustable Gas Block. Lightweight and versatile, the NOXs handguard is well suited for tactical and competition use. Precision machined from 6061-T6 aluminum, it features a top Picatinny rail and M-LOK slots at 3, 6 and 9 o’clock positions. The receiver and handguard are protected by a Type III Class 2 hardcoat anodized matte black finish.

  • Chambered in 300 Blackout AAC with a 1:7 twist
  • Standard M4 feed ramps
  • Pre-installed forward assist and ejection port cover
  • Compatible with MIL-SPEC lower receivers
  • 7075-T6 Billet aluminum upper receiver
  • 6061-T6 aluminum handguard
  • M4 Feed Ramps
  • Monolithic picatinny top rail
  • Type III Class 2 hardcoat anodized finish
  • Melonited adjustable gas block, gas tube and M16 bolt carrier group
  • NEST Flash Hider
  • 5 machined in anti-rotation QD sling mounts
  • Scalloped rails
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Barrel Length8.0
Barrel Material416 Stainless Steel
BrandSeekins Precision
Caliber Gauge300 Blackout
FinishHardcoat Anodized
Gas System LengthPistol
Gas System TypeDirect Impingement
Handguard7 in M-LOK Rail
Muzzle DeviceSeekins Precision Nest Flash Hider
Twist Rate1:7
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

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OH YEA!!!!!!!

by -

I purchased this and the matching Seekins lower for a PDW build. As of this writing, there is not a lot out there by way of reviews on this particular product. After building the complete PDW, I am very happy with it. The build quality is nothing but top notch Seekins, very light, very stealthy and everyone wants to know what it is that I have. The only concern I have is that the end of the rail sits a hair over the end of the barrel where the barrel tapers into the thread; this might pose a problem is I want to throw on my own brake and something like a Surefire Warden to mitigate concussion. Otherwise, this thing ROCKS!!!!!