Technical specifications

According to the NATO Army Armaments Group the differences between the MIL-STD 1913 Picatinny rail and the STANAG 4694 are:

• A metric reference drawing.
• Additional new measurements and tolerances.
• Adjustments of some measurements.
• Reduction of straightness tolerances with approximately 50%.

Another notable change is the recommendation that while in the Picatinny rail system the V-angles are used for the alignment and reference of the accessory, NATO recommends using the top surface instead.
NATO tests have shown that the Picatinny rail system does not provide good repeatability. Using the top surface as a reference and alignment of the grabbers provided excellent repeatability.

Quad Rail Hand guard Type: 2 pcs aluminum.

• Rail type: 4 sides/NAR STANAG 4694
• Material: Anodized aluminum
• Type: AR15/M4 & VARIANT
• Length: 8 inch
• Weight: 14.4 oz