Just when I thought the single Primary Weapons System system was the be all and end all of the awesome uber castle nut debate, Lantac just had to go out and release a similar system. Dubbed the RPS or “Ratchet Plate System” the RPS adds another viable solution for the home-builder to avoid staking their castle nuts.

Unlike the PWS offering, the Lantac RPS opts for an internally oriented design. As the name implies, teeth (facing the end plate, hence “internal”) are locked into place with a corresponding ratchet hook on the end plate. Once installed, Lantac states, “the nut cannot vibrate loose through firing but can be removed through the use of an armorers wrench if necessary.” By having the grooves on the internal face of the castle nut, the system cannot be damaged during normal usage.

For function, the RPS features a standard Q/D socket machined into the end plate. For aesthetics, both the external shape of the end plate and castle nut are milled (though Lantac does not that they do not guarantee alignment once at the proper torque specification). Construction and finish are not stated, but it’s likely steel and a nitride based on Lantac’s other product offerings.

Final release date is not yet set, but Lantac has stated across forums and through reps that the patented RPS is in production for launch as soon as possible.