AR MAGLOCK AR-15 (.223 / 5.56) – Gen 4


AR MAGLOCK Gen 4 Kit – Black (anodized)

Pin not included in the locking kit purchase. Must be purchased separately in the pull down menu below.

Note: Only pins in the drop-down list work with this particular locking kit.

Quantity Discount (Shown In Cart)
2 20% off
3 25% off
4 30% off
SKU: LOCK-223-GEN4 Category: Tags: , , ,


AR MAGLOCK Gen 4 – AR-15 (.223 / 5.56) Fixed Magazine Lock and Release Solution (AR MAGLOCK in anodized black components, KingPin in black or silver stainless).

The Gen 4 and KingPin combo allows for minimal separation (action disassembly) of the upper and lower receivers. The new KingPin holds the upper receiver from flying open when disassembling the action.

Just a simple push on the pin with your thumb opens the action for mag changes, then automatically re-locks when you push the receivers together.

The Gen 4 benefits:

– New set screw on locking arm, allowing for adjustment to ANY receiver width including billet, composite, or 80% non mil-spec receivers.
– Allows for “free state” adjustment when traveling outside California. Just reset the set screw to the end of the post and the locking arm will work just like an OEM magazine release button.

The KingPin benefits:

– Retain your critically important bolt catch
– Seamless double feed clearing
– Bolt hold back on last round
– Fast magazine changes (as fast as OEM mag release button)
– Clear access to your safety selector
– Easy removal from the receiver to fully open the action

All AR MAGLOCK locking kits are patented under USPTO patent number: 8,756,845. KingPin is patented under 10,126,078.

Gen 4 operation demo:

Demo of double feed clearing:

Live fire double feed clearing:

Install video:

Install video 2 (just for good measure):

Note: Note: Due to unanticipated surface changes and unique firearm features from each manufacturer, there may be certain incompatibilities with your firearm system.

WARNING / DISCLAIMER: NEVER while the action is open have the safety “OFF”, and NEVER pull the trigger. For safety reasons, never disassemble your firearm while loaded. Please make sure and check that all rounds are removed before disassembly of the action. With any CA Compliant disassembling device, it is even more imperative that you clear any rounds prior to disassembly.

Always observe the 4 rules of firearm safety:

1. Treat the firearm as if it is ALWAYS loaded
2. Never point it at anything you don’t intend to destroy
3. Keep your finger off the trigger until you’re ready to fire
4. Know your target and it’s surroundings

Evolusion Concepts, Inc. / AR MAGLOCK is not responsible for injury due to mishandling or lack of safety precautions of your firearm.

Additional information

Additional information

Weight 1.00 oz
Dimensions 2 × 3 × 4 cm
Pin Options

No Pin Included, Aluminum Tacticool Rear Pin (.223 / 5.56), Steel Tacticool Rear Pin (.223 / 5.56), Dual Function Pin, Hyperswitch, KingPin Silver, KingPin Black, Patriot Pin

Reviews (3)


  1. d.j.73 (verified owner)

    Love my gen4 mag lock.

  2. Christopher Matthews (verified owner)

    I love this mag release, it works as advertised the only tough part was getting the castle nut loose to install the kingpin with this system. But once I got that loose and the kingpin installed it has worked like a charm. The Mag lock gen.4 works great on the Aero M4E1 lower and upper.

  3. dsrrichter (verified owner)

    I’ve been running a Gen 4 for over year on a 223 Wylde Franken build; Bootleg upper and Spike’s lower. Using it at the flat range, no problems at all. I recent did a home defense class with movement and rapid mag changes; tactical and emergency. I did have one double feed. The instructor thinking I may to dismantle the gun was about to call a cold range. With the Gen 4, I was able to lock the bolt back and open the action just enough to drop the mag and clear the rifle and continue. Awesome!!

    The Maglock does take paitience and tuning get it to run perfectly. I recommend a lot of dryfire with different finger placements to dial it in.

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