Lee Sporting LS5 MP5 FRT Trigger Group — Atrius Forced Reset Selector

Product Description

• What it is: an MP5 FRT trigger group: a complete Lee Sporting LS5 billet aluminum trigger housing with the Atrius Forced Reset Selector, an ALG ACT trigger and a slip trip already installed.
• What it fits: HK SP5 and SP5K, PTR 9-series, Century Arms AP5 and AP5-P, POF-5, MAC-5, Zenith ZF-5 and Dakota Tactical D54, in full size or K. Pick your housing from the chart below.
• How it works: the Atrius selector adds a forced reset position. The bolt’s travel pushes the trigger forward to reset it, so the gun shoots faster while still firing one round per trigger pull.
• What you choose: housing, grip and pictogram finish. Price changes with the grip and the Cerakote option.
• How it ships: order online and it ships straight to your door from Lee Sporting, with no FFL transfer, except to the restricted states listed at the bottom of this page.

Lee Sporting LS5 MP5 FRT trigger group with the Atrius FRS

The Lee Sporting LS5 replaces the factory MP5 trigger housing with a billet aluminum lower built around AR-15 controls. This complete version arrives assembled with the Atrius Forced Reset Selector, so your MP5-pattern gun gets forced-reset style shooting, an AR-15 grip and an AR-pattern trigger in one drop-in swap.

• Atrius Forced Reset Selector: installed and ready to run.
• ALG ACT trigger: modified by Lee Sporting for smooth function in MP5-pattern guns.
• Slip trip: included.
• Billet aluminum housing: moves your firing hand 0.6 in. forward and 0.4 in. closer to the bore axis than the factory lower.
• Steel ejector lever: CNC machined from 4140 alloy steel and nitride coated.
• Ambidextrous pictograms: laser engraved, with optional Cerakote color fill.
• Shipped assembled: fit it to your gun and go.

Which LS5 variant is right for my gun?

Choose the Housing option that matches your MP5-pattern gun. This follows Lee Sporting’s published LS5 variant chart. For grip details and the full fitment FAQ, see our Lee Sporting LS5 variant and grip guide.

Not sure which housing you have, or running a clone that is not listed? Message us with your make and model before you order and we will confirm the right variant.

Grip options

• Magpul MOE-K: a compact, low-profile grip with a steeper, more vertical angle, made for PDW-style setups and short length of pull.
• Magpul MOE+: Magpul’s standard-size MOE grip with a rubber overmolded surface.
• MKM Ultralight Compact Grip (ULCG): just over 30 grams, with a shallow 10.4 degree grip angle suited to compact CQB-style stances.
• Driven Arms VCG-L: a beavertail grip with palm swells, about 1.45 in. wide, that moves your hand roughly 0.2 in. rearward.
• Driven Arms SCG Atom: a 16 degree grip angle with a tapered profile and flared lower ledge.
• Driven Arms Apex: a compact, low-drag grip with a larger palm contact patch and a removable storage floorplate.

Pictogram options

• Standard Pictograms (No Cerakote): laser-engraved ambidextrous pictograms.
• Cerakote 416 Style: color-filled pictograms in the 416 style.
• Cerakote RAL8000 & 416: RAL8000 housing finish with 416-style color-filled pictograms.

Lead time and shipping

Each trigger group is built to order and ships directly from Lee Sporting. Choosing a Cerakote pictogram option adds 2 to 4 weeks. Full Size Semi Shelf housings currently carry an estimated 4 to 6 week lead time. The MP5 trigger housing is not the serialized part of the gun, so no FFL transfer is needed.

MP5 FRT or super safety?

This trigger group uses the Atrius Forced Reset Selector. If you would rather run a classic MP5 super safety, see the Lee Sporting MP5 lower with D2 super safety, and compare the two in our MP5 FRT and super safety guide. Browse all forced reset triggers and selectors.

Additional information