Presma Adjustable Low Profile Gas Block, 0.936” Black Steel

The Adjustable Low Profile Gas Block, 0.936” Black Steel (GB12) is engineered for .308 AR builds that require precise control over gas flow. Designed to fit 0.936″ diameter barrels, this gas block is ideal for heavy-barrel and large-frame AR platforms where reliability and tunability are critical.

The adjustable gas system allows shooters to fine-tune gas flow to reduce recoil, improve cycling, and optimize performance—especially beneficial for suppressed rifles or over-gassed setups. Constructed from high-strength steel with a durable black finish, this gas block is built to withstand high round counts and demanding use.

Its low-profile design provides compatibility with most free-float handguards while maintaining a secure, stable fit. Installation is straightforward using set screws, and all required hardware is included.

Features

• Adjustable gas system for precise tuning

• Fits 0.936″ diameter .308 barrels

• Designed for .308 AR platforms

• Low-profile design for use under free-float handguards

• Steel construction with black finish

Includes

• Adjustable gas block

• Roll pin

• Mounting screws

• Hex wrench

Dimensions

• Height: 1.69″

• Width: 1.15″

• Length: 0.99″

This adjustable .936 gas block is an excellent choice for builders running .308 heavy-barrel AR platforms who want precise gas control without sacrificing handguard compatibility.