Seekins Precision SBR8 Complete Upper 300 Blackout - 8''

SKU: 0011100057
MPN: 0011100057
Manufactured by Seekins Precision


Out of Stock

NOTE: Limit 1 per household. Quantities exceeding 1 will not allow checkout.


Out of Stock


Note: This upper barrel is under 16” and is subject to NFA rules and regulations. It can only be attached to a pistol lower or legally registered SBR lower. Know your local laws before purchasing.

The Seekins Precision SBR8 Complete AR-15 300 Blackout Upper Receiver is designed for use with a suppressor with an 8” barrel and 12” handguard. The Seekins Precision MCSRv2 M-LOK handguard features a large internal diameter that will fit most .30 caliber suppressors. This set up allows you to have a short overall length while giving you more real estate for mounting lights and accessories. The match barrel is machined from 416 Stainless Steel with a 1:8 twist rate and 5R button rifling. It utilizes a pistol length gas system with an adjustable gas block to ensure reliability. The iRMT-R upper receiver is machined from billet 7075-T6 aluminum and hardcoat anodized black and comes fully assembled with bolt carrier group and ambidextrous charging handle.

Warning: Firing this upper receiver without a suppressor can cause catastrophic damage to the handguard and your hand.

  • Designed for use with a suppressor
  • 8” Match grade barrel chambered in .300 BLK
  • 416 Stainless Steel with 1:8 twist
  • Threaded 5/8x24
  • 5R button rifled
  • Pistol length gas system
  • Adjustable gas block
  • 12” MCSRv2 M-LOK handguard
  • iRMT-R billet machined 7075-T6 aluminum upper
  • Ambidextrous charging handle
  • Hardcoat anodized black

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.


Barrel Length8.0
Barrel Material416 Stainless Steel
BrandSeekins Precision
Caliber Gauge300 Blackout
Gas System LengthPistol
Gas System TypeDirect Impingement
Handguard12 in Seekins MCSR M-LOK Rail
Twist Rate1:8 5R

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