SKU: AMLPIN308KPBK
UPC: 646809495113
MPN: PIN308KPBK
The AR Maglock Kingpin in black is a rear takedown pin engineered specifically for AR-10 platforms chambered in .308 Winchester. This component works with Gen 4 AR Maglock locking kits to provide California-compliant fixed magazine functionality without sacrificing practical reload speed. Protected under US Patent 10,126,078, the Kingpin addresses the core challenge facing .308 rifle owners in restricted states: maintaining legal compliance while preserving the rifle's operational utility. For shooters building or upgrading rifles in states with fixed magazine requirements, this pin represents a purpose-built solution rather than a makeshift workaround.
The Kingpin's thumb-activated design allows minimal separation of upper and lower receivers during action disassembly—just enough to release the magazine. A controlled-opening feature prevents the upper receiver from flying open during this process, which protects internal components and maintains shooter control. When the receivers are pushed back together, the pin automatically re-locks without additional manipulation. The system retains full bolt catch functionality, including bolt hold-back on the last round, and provides clear access to the safety selector throughout operation. Compatible with DPMS-style upper and lower units featuring takedown hole diameters between .276 and .280 inches, the Kingpin fits rear detent style lowers rather than pistol grip detent configurations. Double-feed malfunctions can be cleared without tools through the standard disassembly motion.
Shooters who own AR-10 pattern rifles in California or other restricted jurisdictions will find the Kingpin addresses compliance without introducing significant training changes. Magazine changes approach the speed of a standard release button once the thumb-push motion becomes familiar. The black anodized finish matches most lower receivers, and the pin removes easily if the rifle needs to travel to unrestricted states. We stock the Kingpin alongside other parts and accessories for AR-platform builds. Pair it with quality magazines rated for .308 to complete your compliant setup.
The Kingpin fits DPMS-style AR-10 uppers and lowers with rear takedown hole diameters between .276 and .280 inches. It requires rear detent style lowers—pistol grip detent configurations are not compatible. Confirm your lower's detent style before ordering.
No. The Kingpin retains full bolt catch functionality. Your rifle will still lock the bolt back on the last round, and you maintain clear access to the safety selector throughout operation.
Once familiar with the thumb-push motion, magazine change speed approaches that of a standard mag release button. The pin automatically re-locks when you push the receivers back together, eliminating extra steps.
Yes. The Kingpin is 100% California legal and DOJ compliant when used with a Gen 4 AR Maglock kit. The combination creates a fixed magazine configuration that meets current state requirements.
Yes. The Kingpin is designed for easy removal from the receiver. If your rifle travels to or resides in a state without fixed magazine requirements, you can swap back to a standard takedown pin.
WARNING ⚠️ You must be 18 or older to purchase shotgun or rifle ammunition and 21 or older to purchase handgun ammunition and firearms. Please reference our requirements for ammunition orders to "restricted" states HERE. Always make sure you use the correct ammunition for your firearms. Ammo cannot be shipped to a PO Box. Please reference state & local laws before making a firearm or ammunition purchase.
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