AIM SSTAT vs RISE RAVE 140 Trigger Packs
We thought we'd take a quick look at the difference in the two trigger packs, and explain why we switched over to the AIM SSTAT.
The two trigger pack internals are IDENTICAL. Triggers, Hammers, Springs, and Pins, are all the same dimensions. The difference lies in the trigger pack itself. The methods used for taking up slack in the trigger pack, typically used for drop safety, is the main reason for our change. Pictured below, you can see both trigger pack housings.
You can see that the Bronze AIM SSTAT Housing uses set screws, whereas the Black RISE RAVE 140 Housing uses springs.
Because of the springs on the R.R.140, it puts constant pressure on the interface between the back of the trigger and the safety selector. This can cause too much pressure, leading to the safety being unable to be engaged in to the safe position unless pulling the bolt to the rear, or slightly pressing forward on the trigger. This finishes lowering the back of the trigger where it meets the safety selector, and allows engagement in to the "safe" position.
The AIM SSTAT instead uses a set screw design. This allows for precise tuning of tension, and doesn't over tension the trigger in to the safety selector like with the R.R.140 spring design.
You can tell when you have the AIM SSTAT housing adjusted properly through UNLOADED function testing of the different safety positions.
TOO LOOSE:
You will see that both "SEMI" and "SS" positions function as "SS"
TOO TIGHT:
You will see that "SEMI" and "SS" function properly, but "SAFE" cannot be engaged
PROPERLY ADJUSTED:
You will see that "SEMI" and "SS" function properly, and "SAFE" is able to be engaged smoothly, with the same pressure used for "SEMI" to "SS".
This can be done with the rear pin pulled and the upper opened up. The set screws are able to be adjusted from inside the trigger pack without having to remove it from the lower. It is typically easier to adjust/ get the Allen key around the hammer spring if the hammer is fully released forward. Use High Temp - High Strength thread locker on the set screws to ensure they do not move once set. Start with the set screws fully tightened. Do not over-tighten, as simply snugging them up to the housing is sufficient to start. Re-cock the hammer. You will most likely see that "SAFE" is unable to be engaged. Release the hammer again and back out the set-screws 1/8 - 1/16 of a turn at a time (though even less may be all that is required for proper settings) until you can just engage "SAFE". Repeat this process a few times to ensure you have not loosened more than necessary, and ensure other positions "SAFE" and "SS" function properly as well. Once you have completed this process, and the thread locker has set, you should have all three positions functioning properly and engaging smoothly.