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Swiss Schmidt-Rubin Straight-Pull Rifle Database

The HRF Concepts RCM, short for Rifle Combat Magwell, is a magazine-well funnel designed for MIL-SPEC forged AR-15 lower receivers. It substantially increases the magazine insertion area to support faster, more consistent and intuitive reloads while retaining a compact overall profile.

Its geometry provides approximately 250% more funnel surface than a standard MIL-SPEC AR-15 magazine well. This design helps guide magazine insertion from a range of shooting positions and under varied conditions, including reduced visibility or restricted movement.

The current version is made from injection-molded nylon polymer and features a Flat Dark Earth (FDE) finish. It is designed to fit most MIL-SPEC forged AR-15 lower receivers without permanent modification to the firearm.

The RCM is compatible with most common AR-15 magazines, including Magpul M3 PMAGs, as well as high-capacity options such as the Magpul D-60 and SureFire MAG5-60. Always confirm lower-receiver compatibility before purchase and installation.

• HRF Concepts RCM magwell for MIL-SPEC forged AR-15 lower receivers.
• Approximately 250% larger funnel surface than a standard MIL-SPEC AR-15 magazine well.
• Designed to support fast, consistent and reliable magazine changes.
• Compact profile to minimize additional bulk on the lower receiver.
• Injection-molded nylon polymer construction.
• Flat Dark Earth (FDE) finish.
• Compatible with most AR-15 magazines available on the market.
• Compatible with Magpul M3 PMAGs, Magpul D-60 and SureFire MAG5-60 magazines.
• Two-screw installation with no permanent modification to the lower receiver.
• Made in the USA.

• Type: magazine well funnel / magwell.
• Model: HRF Concepts RCM – Rifle Combat Magwell.
• Platform: AR-15.
• Lower receiver compatibility: most MIL-SPEC / TDP forged AR-15 lower receivers.
• Funnel surface: approximately 250% larger than a standard MIL-SPEC magazine well.
• Material: injection-molded nylon polymer.
• Color: Flat Dark Earth (FDE).
• Length: 87 mm / 3.43 in.
• Width: 49 mm / 1.93 in.
• Overall height: 15 mm / 0.60 in.
• Height from inside shelf: 9 mm / 0.35 in.
• Weight: 23 g / 0.6 oz.
• Mounting hardware: 2 RCM 4-40 bolts.
• Installation tool: 3/32 in. hex key.
• Country of manufacture: USA.

The HRF Concepts RCM is designed for most MIL-SPEC forged AR-15 lower receivers, including models from the manufacturers listed below. Compatibility may vary with the exact lower-receiver geometry; always verify your configuration before installation.

• Aero Precision.
• Colt.
• Geissele.
• BCM.
• KAC.
• Daniel Defense.
• Palmetto State Armory, including JAKL.
• FN.
• Anderson.
• SOLGW.
• Centurion.
• Troy Industries.
• Bushmaster.
• Sionics.
• CMMG.
• Wilson Combat.
• Rock River Arms.
• Smith & Wesson.
• Ruger.
• Ballistic Advantage.
• Noveske.
• Springfield.
• MR556A4.
• And many other MIL-SPEC forged lower receivers.

• Compatible with most standard AR-15 magazines.
• Compatible with Magpul M3 PMAGs.
• Compatible with Magpul D-60 high-capacity magazines.
• Compatible with SureFire MAG5-60 high-capacity magazines.

• 1 HRF Concepts RCM Rifle Combat Magwell – FDE.
• 2 RCM 4-40 mounting screws.
• 1 3/32 in. hex key.