Wisconsin Trigger Co. X National Match Trigger equipped Palmetto State Armory (PSA) AR-15 Lower Receiver Sale $325.99

$425.95 $325.99

Out of stock


Each receiver is completely assembled and ready for your upper, with an M-K X trigger installed and tuned.

Each M-K X trigger is hand-assembled and hand-installed into a PSA lower receiver.

Before installation, the M-K X trigger’s front hook and the hammer’s trigger hook are polished. This cuts down on the break-in time.The disconnector is then set to zero creep, to give the shooter the finest and the most crisp release possible in a service rifle. The overtravel is set to short and then each receiver has its trigger weighted using an NRA trigger scale. This ensures it will pass the pre-match tech inspection right out of the box. The trigger pull is set to approximately 5.0Lb to ensure meeting the 4.5Lb minimum weight. After the break in period your M-K X will drop a few ounces. By setting it a bit higher you will still pass tech inspection for years to come. At the time of ordering you may select left or right hand shooter. The M-K X uses our Wisconsin Trigger Company A3 safety selector which may be installed on the left or right side of the receiver. With the A3 safety selector you only have one switch paddle so nothing gets in the way of your grip, giving you a constant and precise hand position every time.

The Receiver From Palmetto State Armory (PSA)

Forged Mil-Spec Lower
Made from 7075-T6 Aluminum material
Black Hardcoat Anodized Finish
Multi Caliber
“Safe” & “Fire” marked Fire Selector
High Shelf Lower

Trigger Settings

Pull is set to approximately 5.0Lb to ensure meeting the 4.5Lb minimum weight.

Short set overtravel

Zero Creep tuned X National Match disconnector

Safety selector installed on the left or right side your choice

With the M-K X trigger you can always swap out the springs to raise or lower the pull weight and change the first and second stage split. There is no need to readjust the disconnector when you do this. As you gain experience and want to change the pull weight split to better match your changing shooting style, you can do so.

Other components

A2 GI type Buttstock with trapdoor and cleaning equipment compartment, with room to add your stock weights

GI type Full length Buffer and Buffer Spring

A2 GI type Pistol Grip

GI type Trigger guard

Mil-spec springs, pins, detents and other lower components

More receiver information:

PSA uses the current advanced manufacturing technology, the same process found in the aerospace industries. This is a high quality forged Mil-Spec lower. PSA uses 7075-T6 material, finished in Black Hardcoat Anodizing per MIL-8625 Type 3 class 2. The receivers are machined on multimillion dollar, automated CNC manufacturing system, enabling PSA to produce a product of unequaled quality. This is why The Wisconsin Trigger Company has decided to use the PSA receiver as a home for the incredible and unequaled M-K X trigger.

More information on the M-K X

The M-K X is the latest AR-15 National Match trigger from the Wisconsin trigger company. Built specifically for national match and long range competition, the M-K X uses a national match purpose designed X disconnector. The new X disconnector has a long reset and the finest release on the market. This is very beneficial when using optics by reducing the amount of movement the shooter sees during the hammer release. Combined with the adjustable overtravel, adjustable second stage weight, multiple trigger springs, Bronze Advantage and the Wisconsin Trigger Company left or right install safety selector you have it all in one trigger.

The M-K X is the trigger used by Madison Butler of the Texas State Rifle Association Jr. Team to set the current Junior world record in 2017 scoring a 498- 24x and placed her as the top woman shooter and the 1st Junior and 6th overall competitor in the nation for EIC matches in 2017.

The Finest National Match Trigger AR-15 is just a click away.

The M-K X is a Bronze Advantage trigger. What is the Bronze Advantage?

About The Bronze Advantage

Extremely slippery bronze gives the M-K II standard pin models the smoothest, drag-free pull through first and second stage.
Bronze Advantage is not available in large pin models M-K II A1 and A2

  • Bronze insert installed in the trunnion and machine finished to fit the receiver pin
  • Added lubrication retention with less lubrication required
  • Less pin to trigger friction with low pin wearOrdering notes:

***We do not ship rifles or lower receivers to CA, CT, MA, NJ, & NY***

* This item may only be ordered by phone. Order line is (920) 988-7057

* This item will not be shipped until a signed copy from your FFL dealer has been received.

* This item must be shipped to a licensed Federal Firearms Dealer.

* You must secure a dealer to receive your firearm.

Find a dealer near you:

* The Wisconsin Trigger Company, INC. must have a copy of your or your dealers FFL on file before we can ship this item.

* All state and local laws will be followed.