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Questions & Answers
Will this fit an M&P-10 (.308)? I note some gas block require a process called "dimpling". What is this process? Does this gas block require this? Expert Answer

This gas block will fit any AR barrel that uses a .750 diameter gas block. This barrel uses set screws which would highly benefit from dimpling the barrel. Dimpling the barrel is the process of drilling small dimples into the barrel where the set screws can "lock" into place and secure the gas block. The dimples do not need to be deep and only the very tip of the set screws needs to be fit into the dimple. There are a ton of videos of people doing it online themselves, although we recommend you have an experienced gunsmith/armorer do the dimpling.

by Armando R., Gear Expert, December 26, 2019
Customer Reviews
Most Recent Reviews
guntec gas block by allen, Verified Owner, June 24, 2025
the guntec ar ultralight skeletonized gas block is my go to on any ar build .
Most Recent Reviews
guntec gas block by allen, Verified Owner, June 24, 2025
the guntec ar ultralight skeletonized gas block is my go to on any ar build .
Most Recent Reviews
AR15 Gas block by Glenn, Verified Owner, April 17, 2025
Great finish on product. Strong and light weight. Couldn’t be happier with it.
Most Recent Reviews
exact fitment by jonjon1993, Verified Owner, February 3, 2025
This product was explained extremely well in the description. It was exactly what they said it was
Most Recent Reviews
Guntec AR-15 Gas Block by Johnny Frew, Verified Owner, June 12, 2024
Guntec always nails it. Quality, cosmetics, and performance on this light weight gas block.
Read All 5 Reviews
Color:
Black
Gas Block Journal Size-Diameter:
.750 in
Gun Model:
AR-15
Additional Features:
Non-adjustable

Code: 2AH-RGB-A1USGB-GT750SS-ULTRA

MPN: GT750SS-ULTRA

UPC: 709016729997

List: $59.95Save 47%
$31.99

Product Info for Guntec USA AR-15 Ultralight Skeletonized Gas Block

The GUNTEC Ultralight skeletonized gas block is for use with AR-15 rifles with a .750 gas block journal. When a .750 gas block is used, the extra material required to skeletonize the gas block is not needed, as the skeletonized version gains additional weight. This reinforces the design of the lightweight gas block. While the term skeletonized is a bit misleading, this block is still considered to be skeletonized due to the fact that the openings for the extra material do not exist. The extra material in the skeletonized version is merely extra material that strengthens the block without adding unnecessary weight. The .750 gas block is for use with .750 journal bearings, most common used in AR-15 rifles. The GUNTEC Ultralight skeletonized gas block is designed to be used primarily with .750 journal bearings, most common used in AR-15.image

Specifications for Guntec USA AR-15 Ultralight Skeletonized Gas Block:

Manufacturer: Guntec USA
Color: Black
Fabric/Material: Steel
Gas Block Journal Size-Diameter: .750 in
Gun Model: AR-15
Additional Features: Non-adjustable

Features of Guntec USA AR-15 Ultralight Skeletonized Gas Block

  • .750 Diameter
  • Black Nitride Finish
  • Steel
  • Skeletonized Ultralight Series Model
  • Reinforced Design
  • Three Set Screws
  • Lightweight
  • Roll Pin Included

Package Contents:

  • Guntec USA AR-15 Ultralight Skeletonized Gas Block

Guntec USA AR-15 Ultralight Skeletonized Gas Block Orderable Models

List of Orderable Models

  • Guntec USA AR-15 Ultralight Skeletonized Non-Adjustable Gas Block, Steel, Low Profile, .750 Diameter, Nitride, GT750SS-ULTRA , MPN: GT750SS-ULTRA , UPC: 709016729997 , Code: 2AH-RGB-A1USGB-GT750SS-ULTRA

Guntec USA AR-15 Ultralight Skeletonized Gas Block Unavailable & Discontinued Models

List of Unorderable Models

  • Guntec USA AR-15 Ultralight Skeletonized Adjustable Gas Block, Steel, Low Profile, .750 Diameter, Nitride, GT750SS-ULTRA-ADJ , MPN: GT750SS-ULTRA-ADJ , UPC: 709016730009 , Code: 2AH-RGB-A1USGB-GT750SS-ULTRA-ADJ
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