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Questions & Answers
This comes with buffer spring?

Geissele website for this model number states it comes with spring and H1 buffer.

by Hawkeye, Verified Owner, October 7, 2025
This says it’s 1-8 barrel twist but geisseles websites says it’s 1-7?

I have the ddc it’s 1-8 twist. Although the black one says 1-7 my ddc was labeled 1-8 on the box when I received it.

by todd 606, Verified Owner, December 1, 2025
2 Models Available
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Product Info for Geissele Super Duty Mod1 8in Upper Receiver Group

The Geissele Super Duty Mod1 8in Upper Receiver Group was created in order to be the ideal item for anyone in need of a top quality selection..image

These AR15 Upper Receivers through the skilled product specialists at Geissele are designed by using heavy duty and dependable components, to be able to supply you with a product which is going to be effective for quite some time. Designed using some of the most useful accessible substances and construction, these special AR15 Upper Receivers from the product professionals at Geissele can last an exceptionally lengthy time.

Geissele has been generating high-quality products for a number of years, and the Geissele Super Duty Mod1 8in Upper Receiver Group is their way of revealing exactly how much they are concerned.

At OpticsPlanet, we ensure that it is our obligation to obtain the most suitable product for your preferences, and featuring the Geissele Super Duty Mod1 8in Upper Receiver Group is one thing that we're pleased to offer.

WARNING: California`s Proposition 65

Specifications for Geissele Super Duty Mod1 8in Upper Receiver Group:

Manufacturer: Geissele
Caliber: .300 AAC Blackout
Overall Length: 17.125 in
Barrel Length: 8 in
Gas System Length: Pistol Length
Barrel Twist Rate: 1-8
Threads per Inch: 5/8x24
Muzzle Device: HUXWRX Flash Hider-QD 762
Finish: Type 3 Hardcoat Anodize
Fabric/Material: Aluminum & Steel
Handguard Length: 7 in
Bolt Carrier Group Included: MIL-SPEC
Magazine Included: No
Charging Handle Included: MIL-SPEC

Package Contents:

  • Geissele Super Duty Mod1 8in Upper Receiver Group

Geissele Super Duty Mod1 8in Upper Receiver Group Orderable Models

List of Orderable Models

  • Geissele Super Duty Mod1 Upper Receiver Group, Complete, 8in, 300 Blackout, Black, 08-553B , MPN: 08-553B , UPC: 810081134323 , Code: 1TO-URC-ADE13-08-553B
  • Geissele Super Duty Mod1 Upper Receiver Group, Complete, 8in, 300 Blackout, DDC, 08-553S , MPN: 08-553S , UPC: 810081134330 , Code: 1TO-URC-ADE13-08-553S
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