Product Overview
Midnight MP5 Madness
This drop is built around two parts that change how your MP5 feels in hand.
The LS5 trigger housing gives you a stronger, more ergonomic foundation than the factory setup. The Atrius selector brings a more purposeful control interface to the package.
This is not about cosmetic changes. It is about improving how the platform fits the shooter.
What’s Included
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Lee Sporting LS5 Incomplete Trigger Housing
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Atrius Forced Reset Selector
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Your choice of LS5 housing configuration:
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Full Size Semi Shelf
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Full Size Push Pin
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K Semi Shelf
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K Push Pin
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About the LS5 Housing
The LS5 is a billet aluminum trigger housing for MP5 variants.
It is designed to improve ergonomics by shifting the firing hand forward 0.6" and closer to the bore axis by 0.4". It also supports AR-pattern trigger compatibility and uses a CNC-machined 4140 steel ejector lever that is heat-treated and nitride coated. Semi-shelf versions include multiple inserts for varying shelf height, and full-size versions include a 50D buffer to short-stroke the bolt carrier and help prevent hammer override. Empty weight is 6.2 oz.
Which LS5 Variant is Right? – leesporting
About the Atrius Forced Reset Selector
The most robust solution on the market that enables the user to have 3 positions; SAFE, SEMI (Traditional) and FULL-SEMI. This Forced Reset Selector (FRS) is compatible with mil-spec AR15 (chambered in .223/5.56/.300 BLK) fire control groups and no modifications required. The Atrius FORCED RESET SELECTOR isn’t just a safety, it’s an advantage.
For all notes on Compatibility GO to our Compatibility Page here.
PRODUCT FEATURES
- Drop-In Installation – Swap out your factory safety in minutes and experience the next level of firearm manipulation (some fitment may be required).
- Runs with Mil-Spec Fire Control Groups – Seamlessly integrates with standard AR fire control groups, ensuring flawless function and longevity without modification.
- Hardcore Durability – Crafted from heat-treated, 4140 steel and coated in a corrosion-resistant finish, the Atrius FRS laughs in the face of wear and tear. Rain, mud, sweat—it eats it all for breakfast.
- Mechanically Leveraged Design – Our Forced Reset Selector (FRS) reduces wear on your rifle, preserving your weapon’s longevity — unlike forced-reset triggers (FRTs) that accelerate internal component degradation.
- Ultra-Smooth Engagement – Crisp, tactile clicks with no mushy nonsense. Designed for 90-degree throw engagement.
- Positive Positioning Without Slippage – Engineered for rock-solid engagement, eliminating the risk of unintentional movement mid-fire, keeping you in full control at all times.
- Aggressive Ergonomics – Textured, chamfered, and purpose-built for speed. Your thumb finds the selector instantly, even under stress, with no fumbling, no hesitation—just pure control.
- MADE IN THE USA – Proudly manufactured by Americans for Americans.
Upgrade your firepower. Own your control. Rule the game.
Legal Notice and Disclaimer: When buying this product you are affirming that you understand all federal, state, and local gun laws that apply to you. Laws surrounding firearms and their parts or accessories vary between each state so it is your responsibility to know what is legal in your area.
Atrius Development Group does not guarantee that our products are legal where you live, and we are not responsible for any misuse, illegal activity, or violations of the law by customers. By completing your purchase, you agree that you are complying with all applicable regulations.
Restricted States: CA, CT, DE, FL, HI, IL, MA, MD, MN, NJ, NY, OR, RI, WA, D.C., No US Territories. No international orders.
Why It Matters
Factory MP5 controls can feel dated.
This setup gives you:
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Better hand position
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Better selector interface
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Better overall control feel
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A stronger foundation for a more refined build
Compatibility
Choose the LS5 version that matches your host platform.
Supported variants include:
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PTR full size and K models
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HK SP5, SP5K, SP89, 94
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Century Arms AP5, AP5P, AP5SD
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Zenith ZF-5 family
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Dakota Tactical models
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MAC-5 and MAC-5K
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POF-5 variants
Minor fitting may be required, since MP5 receivers can vary due to weld tolerances.
Important Note
This listing includes the LS5 incomplete trigger housing and Atrius selector. It is not a complete trigger pack.
Pricing
Retail Value: $589
Midnight Box Price: $459
Limited Drop
This is a limited release and availability is not guaranteed once sold out.
Fitment Help
Not sure which housing version you need? Reach out before ordering and we’ll help you choose the right one.
