AR-15 SENTRY ADJUSTABLE GAS BLOCKS STEEL SET SCREW Reviews & Ratings

The SLR Rifleworks Sentry Adjustable Set-Screw Gas Block ensures that AR-15 shooters have the ability to fine-tune their gas system for optimum operation. The SLR Rifleworks Sentry Adjustable Set-Screw Gas Block is constructed with a simple metering system that doesn't use springs or balls and is adjustable through the use of an included tool.

Machined from 4140 steel
Features QPQ Melonite finish
Comes in .625, .750, .875 and .936 diameter sizes

The SLR Rifleworks Sentry Adjustable Set-Screw Gas Block is equipped with two set screws that lock the block into the barrel for an ideal gas seal.

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SLR adjustable gas block

This gas block was very easy to install. My barrel was not dimpled, and so to aid in perfect alignment the first try, I invested in SLR Dimple jig. $40. well spent. Made my first install effortless. This block was very easy to tune and works flawlessly suppressed as well as not. I will be adding it to another rifle very soon as adjustment is simple without disassemble of hand guard. High quality...highly recommended. Shipped quickly but UPS Postal Innovations is about the slowest method.