The Brownells BRN-4 handguard retaining screw is a US-made replacement part for HK416 and MR556 rifle owners who need to replace a lost, damaged, or stripped screw. This is one of those small but essential components that keeps your rail system secure and your setup running reliably. Whether you're maintaining a rifle you've had in the safe for years or troubleshooting a fresh build, having the correct OEM-spec fastener on hand beats jury-rigging a solution or waiting for a parts shipment when you're ready to get back to the range.

Brownells engineered this screw to match the original specifications for HK416 and MR556 platforms, so you get a proper fit without guessing on thread pitch, head style, or material. It's the kind of seemingly minor part that becomes critical when you realize a loose handguard affects zero and reticle stability—and accurate shooting depends on both.

Keep a spare in your range bag or tool kit. For shooters who swap handguards, build multiple uppers, or simply want to be ready for field repairs, stocking the right fasteners is just part of responsible rifle ownership.

The Brownells BRN-4 handguard retaining screw is a US-made replacement part for HK416 and MR556 rifle owners who need to replace a lost, damaged, or stripped screw. This is one of those small but essential components that keeps your rail system secure and your setup running reliably. Whether you're maintaining a rifle you've had in the safe for years or troubleshooting a fresh build, having the correct OEM-spec fastener on hand beats jury-rigging a solution or waiting for a parts shipment when you're ready to get back to the range.

Brownells engineered this screw to match the original specifications for HK416 and MR556 platforms, so you get a proper fit without guessing on thread pitch, head style, or material. It's the kind of seemingly minor part that becomes critical when you realize a loose handguard affects zero and reticle stability—and accurate shooting depends on both.

Keep a spare in your range bag or tool kit. For shooters who swap handguards, build multiple uppers, or simply want to be ready for field repairs, stocking the right fasteners is just part of responsible rifle ownership.