Daniel Defense has introduced its new DDM4 rail that will be offered standard on most Daniel Defense rifles.

The DDM4 rail uses the company's "bolt-up" system. Instead of six bolts, the DDM4 rail requires only four bolts. The lower rail in this model is closer to the barrel and was designed for the most optimal ergonomics, according to the company.

"This one-­piece design has a more narrow profile which lends itself to    better weapon manipulation," said Jordan Hunter, marketing manager at  Daniel Defense.

Front and rear sling adaptors are integrated into the left and right side rails. The DDM4 rail measures 1.9 inches wide and 2.165 inches high with an inner diameter of 1.08 inches.

Aside from the slimmer, more compact design of the rail, the length    required for each DDM4 model will not change. Versions traditionally offered    with an Omega X or Omega X with FSP will be replaced with the DDM4 rail  with same length and option based on the barrel configuration.     

Unlike the other rail systems offered by Daniel  Defense, the DDM4 rail will only be offered as part of a complete rifle or upper receiver group and will not be available for individual sale.

Two of the Daniel Defense versions will remain unchanged. The DDM4v7 series will continue to be built utilizing the Daniel Defense Modular Float Rail  12. Production of the Daniel Defense MK18 will continue to include the RIS II rail that was designed for USSOCOM.