The Yankee HIll Machine YHM-5120 7.28 Inch SLR-Smooth Series Forearm - Carbine Length was designed to address the two main customer requests regarding our other handguard models. The number one request was to make a thinner handguard. Both versions are slimmer than our current handguards, the smooth being more than 5/8 inch thinner than the current YHM quad rail design! The second most common request was to design a handguard that would accept most aftermarket piston systems. The new profile of the SLR allows for most piston systems to be used while maintaining a top rail that co-witnesses with the upper receiver.
They also redesigned the top rail so that when installed it creates one continuous picatinny rail between the upper receiver and the handguard. Also redesigned is their method for attaching the handguard to the receiver. NO EXTRA TOOLS are needed to install the SLR handguards! The smooth (customizable) version allows you to mount accessory rails to the sides and bottom if you desire using the same Customizable Forearm Rails that we currently offer.