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.

AIM SSTAT Housing in Bronze - RISE RAVE 140 Housing in Black

You can see that the Bronze AIM SSTAT Housing uses set screws, whereas the Black RISE RAVE 140 Housing uses springs.

Rise Rave 140 Trigger Housing with spring tension design

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.

AIM SSTAT Housing with set-screw tension design

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.

Comparison of MJF & FDM Leber V2 Grip Modules

We just wanted to share some comparison photos between our HP MJF nylon lowers and other's carbon fiber nylon FDM printed lowers. You can clearly see the difference in overhang areas, but beyond that, you can see differences in layer lines, surface quality, resolution/ detail, and more! We've overexposed some of the photos to try and better show the detail of some of the areas of the FDM printed Grip Modules.

Our HP MJF Nylon12 Leber V2 Grip Modules

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Other's FDM Carbon Fiber Nylon Leber V2 Grip Modules

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The difference is clear to see!

MJF vs SLS vs FDM Printing - Leber Lowers

We will take a small dive in to the benefits of HP MJF printing over SLS, as well as more common FDM printing!

HP MJF

Multi-jet fusion (MJF) is a type of 3D printing technology developed by Hewlett-Packard (HP). It works by depositing powder in layers, spraying it with a fusing and detailing agent, and then bonding it together with heat for each layer pass.

SLS

Selective laser sintering (SLS) is an additive manufacturing technique that uses a laser as the power and heat source to sinter powdered material, binding the material together to create a solid structure.

FDM

Fused Deposition Modeling is the traditional 3D printing process that uses a continuous filament of a thermoplastic material. Filament is fed from a large spool through a moving, heated printer extruder head, and is deposited on the growing work.

Feature / Metric	Multi Jet Fusion (MJF)	Selective Laser Sintering (SLS)	Fused Deposition Modeling (FDM)	Firearm Lower Impact
Material Strength	Isotropic: Equal strength in all directions	Anisotropic: Weaker along Z-axis	Highly Anisotropic: Prone to layer splitting	MJF resists cracking better during recoil
Isotropic Mechanical Integrity	Maximum: Identical structural strength along X, Y, and Z axes	Moderate: Z-axis layer bonding is noticeably weaker than X/Y	Low: Weak Z-axis bonds prone to delamination under sudden shear stress	MJF uniformly absorbs multi-directional recoil shock without risk of splitting along flat layer lines
Dimensional Accuracy	High: Finer detail resolution	Moderate: Prone to minor thermal warping	Variable: Highly dependent on printer calibration	MJF ensures drop-in fitment for parts like trigger groups, reinforcement plates, springs, and pins
Surface Finish	Smooth, semi-matte charcoal, then dyed black	Rough, grainy sand-like texture	Visible layer lines and support structure scars	MJF looks closest to a factory injection-molded lower
Porosity & Fluid Resistance	Low: Dense structure blocks gun oils	Moderate: Can absorb solvents if left unsealed	High: Micro-gaps between lines can trap moisture/oil	MJF resists chemical degradation best over long-term use and cleaning
Support Structures	None: Self-supporting powder bed	None: Self-supporting powder bed	Required: Leaves surface blemishes when removed	MJF leaves pristine internal cavities for parts requiring higher, tighter tolerances
Thread & Pin Shear Resistance	High: Fusing agents create a highly cohesive internal matrix	Moderate: Grainy internal structure can micro-fracture under high localized stress	Low: Threaded areas and pin locations easily strip out/ break along extruded filament lines	MJF holds up better to cyclic slap, and grip module pin holes resist egging out under repeated fire
Mating Surface Friction & Fit	Ultra-Low: Smooth, uniform surface reduces mechanical drag	High: Grainy, sandpaper-like texture increases resistance	Variable: Ridged, uneven layer lines create inconsistent drag profiles	MJF provides less resistance in any moving parts such as safeties, safety detents & springs, magazine releases, etc
Environmental & Thermal Stability	High: Uniform material density prevents localized thermal expansion	Moderate: Prone to minor dimensional shifting when exposed to sunlight/heat	Low: Low glass transition temperatures can cause sagging under sunlight/ heat	MJF maintains its exact shape and dimensions during hot rapid-fire sessions or when left inside a hot vehicle

While you can clearly see above why MJF wins over SLS and FDM printing, we also want to dive a little deeper in to the specs of our grip modules in specific. Our grip modules are printed from Nylon12 at a 80.0 µm layer thickness at 100% infill. The Nylon12 is typically grey in color, but is dyed black for our grip modules to better match the OEM HK grip modules. We then post process the grip modules with mechanical finishing to further increase the mechanical and physical properties. The post-processing compresses the surface layer to seal pores, making the component highly resistant to scratches and dirt. It transforms the standard matte finish into a uniform semi/matte-gloss with a softer hand feel compared to unprocessed parts. It also helps to homogenize the outer shell of the part, making it absorb dyes more uniformly compared to SLS or FDM.