Seekins Precision AR-15 Pistol SBR8 Billet Upper Receiver Assembly 300 AAC Blackout 8" Barrel with 12" MCSR Handguard

  • Product #: 623992
  • Seekins Precision #: 0011100057
  • UPC #: 811452027589
Seekins Precision AR-15 Pistol SBR8 Billet Upper Receiver Assembly 300 AAC Blackout 8" ...
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3 at this price
MSRP: $899.00
Ships tomorrow from MidwayUSA
Made in USA

Product Overview


  • Specifically Made For Use With A Suppressor
  • 8” Match Grade Barrel
  • Pistol Length Gas System
  • 12” MCSR MLOK Hand Guard
  • IRMT-R Billet Upper
  • Melonite Adjustable Gas Block, Gas tube and M16 Bolt Carrier Group

The SBR 8" is designed for use with a suppressor. It is configured to keep the overall length to approximately that of a standard carbine by the use of a short barrel and the Seekins Precision MCSR M-LOK hand guard. This allows the handguard to cover part of the suppressor, protecting the shooter from suppressor and letting the shooter use a comfortable support grip further forward on the handguard.

The SBR 8" uses the iRMT-R Upper Receiver - CNC Machined from 7075-T6 billet aluminum. The iRMT-R Upper Receiver’s hand guard mount is machined into the upper to strengthen the receiver and maintain accuracy throughout long shot strings. Coupled with the receiver is the Seekins Precision 12” MCSR M-LOK handguard designed for use with a suppressor. The length allows for a forward hold or closer to the receiver for CQC situations. Both receivers and the handguard are Type III Hardcoat Anodized matte black.

An 8” Seekins Precision match grade barrel is perfect for this suppressed configuration. Each barrel is inspected four times to insure match grade tolerances for maximum accuracy and performance. Chambered in .300 BLK.

Tuning the gas system is critical to maximize performance and reliability. The SBR 8" comes with the Seekins Precision Adjustable Gas Block, Pistol length Gas Tube and M16 Bolt Carrier Group to fine tune the gas system for smoother cycling and operation. All are Melonite coated to resist corrosion and wear. This also aids in easier cleaning, as carbon build up will not adhere to the non-reflective coated surface as much as it does on standard Parkerized finishes.



Made In United States of America
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Delivery Information

Must Ship to FFL Dealer Yes
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Ships Alone Yes
Oversized Yes
DOT- Regulated Yes
Carrier Restrictions
  • Cannot ship via air
  • Cannot ship via USPS
  • Cannot ship to PO Box
  • Must ship to Contiguous US
HazMat Product Yes

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