The SL-15 is Hoffman Tactical's latest 3D-printed AR-15 lower receiver, version 4.8, featuring significant design improvements over previous iterations. Key upgrades include aluminum front takedown pin plates and a 45-degree detent pin for enhanced strength, a widened magwell for better magazine compatibility, and refined internal geometry for aftermarket part fitment. The design also incorporates an integrated grip and a rear takedown pin accessible with a cartridge rim, alongside proven buffer tower reinforcement via a hose clamp.
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