Acheron QD55x Extended M-LOK Rail System - Free Float Handguard for AR15 Rifle Builds

The Acheron QD55x Rail is the premier optic rail for any SG 55x rifles with a diopter sight receiver. After initial adjustment, it can be removed and reinstalled in the blink of an eye with just the tip of a bullet – all without losing zero. There is no tensioning screw that can be overtightened or come loose on its own. A spring-loaded plunger pushes the rail onto the prism at the front end of the receiver instead. The force of the spring does not change under the influence of thermal expansion due to changes in temperature. A locking lever blocks the plunger to eliminate the risk of releasing the optic if the rifle is put in a rack too forcefully.

The extended length of the QD 55x Rail is made for the original polymer handguard and allows for optic combos that don’t fit the standard length. This rail is not compatible with other handguards.

Designed, manufactured, finished and assembled in Switzerland.