The Smith & Wesson M&P15 Sport II is a popular AR-15 platform rifle, appreciated for its reliability and affordability. Many owners, however, seek to enhance their rifle's performance and aesthetics through upgrades. One common modification is replacing the standard gas block with a low-profile version. This guide will explore the benefits, considerations, and installation process of a low-profile gas block for your M&P15 Sport II.
Why Choose a Low-Profile Gas Block?
A low-profile gas block sits closer to the barrel, offering several advantages:
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Improved Aesthetics: The lower profile creates a cleaner, sleeker look, eliminating the bulky appearance of a standard gas block. This is a purely aesthetic upgrade, but many shooters value the improved look.
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Enhanced Handguard Compatibility: Low-profile gas blocks are crucial for installing free-float handguards. These handguards attach directly to the barrel nut, providing superior stability and accuracy compared to standard quad-rail systems that attach to the gas block. If you plan on upgrading your handguard, a low-profile gas block is almost always a necessity.
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Weight Reduction (Minor): While not a significant weight savings, the smaller size of a low-profile block does contribute to a slightly lighter overall rifle weight.
Choosing the Right Low-Profile Gas Block
Several factors are important when selecting a low-profile gas block:
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Material: Gas blocks are typically made from steel or aluminum. Steel is more durable but heavier, while aluminum is lighter but potentially less durable.
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Gas Block Type: You'll encounter two main types: clamp-on and pinned. Clamp-on gas blocks are easier to install and remove, while pinned gas blocks offer greater security and are generally considered more robust.
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Diameter: Ensure the gas block's inner diameter is compatible with your M&P15 Sport II's barrel diameter. This is crucial for proper gas flow and function. Incorrect sizing can lead to malfunctions.
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Manufacturer Reputation: Choose a reputable manufacturer known for producing high-quality, reliable components.
Installation: A Step-by-Step Guide (General Overview)
Disclaimer: This section provides a general overview. Always consult the specific instructions provided with your chosen gas block. Incorrect installation can damage your firearm. If you are not comfortable performing this modification, seek the assistance of a qualified gunsmith.
The process generally involves these steps:
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Disassembly: Carefully disassemble your upper receiver, removing the handguard, bolt carrier group, and any other necessary components.
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Barrel Removal (Often Necessary): For many installations, removing the barrel from the upper receiver is necessary for easier gas block installation. This is generally done by removing the barrel nut and carefully sliding the barrel out. Refer to your firearm's manual for specific instructions.
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Gas Block Installation: Carefully align and install the new low-profile gas block according to the manufacturer's instructions. This may involve using tools such as a gas block wrench.
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Reassembly: Reassemble your upper receiver, ensuring all parts are correctly installed and functioning smoothly.
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Function Check: Before using your rifle, always perform a thorough function check to verify proper operation of the gas system.
Conclusion
Upgrading your M&P15 Sport II with a low-profile gas block can improve aesthetics, enhance handguard compatibility, and contribute to a slightly lighter rifle. However, proper selection and installation are crucial for maintaining reliable function. Always prioritize safety and consult with a qualified gunsmith if needed. Remember that this is a modification, and improper installation could void any warranties. Research thoroughly and choose parts from reputable manufacturers.
