Seekins Precision 16" NX16 .223 Wylde 1:8 Mid-Length Complete AR-15 Upper - 15" NOXs M-LOK Rail

Manufactured by Seekins Precision
SKU: PA0011100077
MPN: 11100077
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 NX16 Complete Upper Receiver is CNC machined from a solid billet of 7075-T6 aluminum, to exceed MIL-SPEC requirements. Chambered in .223 Wylde, 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 .223 Wylde with a 1:8 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
  • Rook Flash Hider
  • 5 machined in anti-rotation QD sling mounts
  • Scalloped rails

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Barrel Length16
Barrel Material416 Stainless Steel
BrandSeekins Precision
Caliber Gauge.223 Wylde
FinishHardcoat Anodized
Gas System LengthMid-Length
Gas System TypeDirect Impingement
Handguard15 in M-LOK Rail
Muzzle DeviceFlash Hider
Twist Rate1:8
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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Fan for Life Now


I mated this upper on a, cheap run of the mill, receiver with a Geissele Super 42 buffer system. It has been the smoothest firing Ar15 I have ever own and shot. Everything is smooth, and the recoil is subtle with incredible accuracy. The furthest I have shot was 100 yards with an Eotech, and the acclaimed accuracy is well earned. I'm very glad I bought this upper and will buy from Seekins Precision again.