CA Compliance:
California compliance
- Status: Legal to own in California.
- Configuration: Fixed magazine (AR MagLock), installed by WBT. The rifle keeps its pistol grip, adjustable stock and flash hider. To reload, you open the action, swap the magazine and close it.
- Magazine: 10-round.
- Your options: If this page shows a compliance selector, choose the build you prefer and we configure it that way. If not, this is the configuration we offer by default; on AR-pattern rifles and some AKs a different build is often possible, so ask us before you order.
- Upgrades: Add the KingPin quick-release takedown pin for faster reloads. See California Compliance Upgrades; add it to this order and it ships installed.
- Learn more: How fixed-magazine rifles work · How featureless rifles work · Why some rifles can only be built one way
About this rifle
The Palmetto State Armory M16A4 (20") is an AR-15 platform rifle chambered in .223/5.56 with a 20" barrel and a 10-round capacity. Finish: Black. WBT configures it for California at our Yuma, Arizona warehouse before it ships.
Manufacturer details
Barrel : 20" 4150V Chrome Moly vanadium steel, nitride coated and chambered in 5.56 NATO with a 1 in 7" twist. The rifle-length gas barrel is finished off with a quad rail handguard with vertical grip and rail covers, a .750 Front Sight Base, and an A2 flash hider.
Upper : Forged 7075-T6 A3 AR upper is machined to MIL-SPECS and hard coat anodized. Uppers include forward assist and dust cover. These uppers are made for us right here in the USA by a mil-spec manufacturer. Includes carry handle assembly.
Bolt : Full-auto profile bolt carrier group. Shot-peened, mil-spec Carpenter No. 158® steel bolt. Gas Key Hardened to USGI Specifications, Fastened with Grade 8 screws, and Staked Per Mil-Spec.
Lower : This "M16A4" forged lower is quality made using 7075-T6 aluminum and is marked "CAL. 5.56 MM" for caliber. The finish is hard coat anodized. Finished with an A2 Classic Grip, Classic A2 Stock, and rifle-length 7075 buffer tube. The fire control group is a PSA mil-spec finished, single-stage assembly.
Details
Barrel Length : 20"
Barrel Profile : A2
Gas System : Rifle Length
Barrel Steel : 4150V Chrome Moly Vanadium
Barrel Finish : Nitride
Chrome Lining : No
Muzzle Thread : 1/2x28
Chamber : 5.56 NATO
Twist Rate : 1:7
Barrel Extension : M4
Diameter at Gas Block : .750
Gas Block Type : Front Sight Base
Muzzle Device : A2 Style
Receiver Material : Forged 7075 T6 Aluminum
Receiver Type : M4
Handguard Type : Quad Rail with Vertical Grip and Rail Covers
Bolt Carrier Group Included : Yes
Bolt Steel : Carpenter 158
Bolt Carrier Profile : Full-auto
Charging Handle Included : Yes
Fire Control Group : Standard Mil-Spec Trigger Group
Grip : Classic A2, Black
Buffer Tube : 7075 T6 Aluminum
Adjustment : Fixed
Stock : Classic A2 Stock
Specifications
- Brand: Palmetto State Armory
- Caliber: .223/5.56
- Action: Semi-Automatic
- Capacity: 10
- Barrel: 20 in
- Finish / color: Black
- California compliance: Fixed Magazine – MagLock
- Manufacturer part #: 51655226758
- UPC: 51655226758
Buying from WBT Guns
- Delivery: Free pickup at our La Mesa store with no transfer fee, or shipment to any California gun store you choose. Select your FFL at checkout.
- Compliance guarantee: Every firearm leaves our shop in the configuration described on this page, function-checked by our compliance team.
- Payment: Pay in full, put 50% down with the balance due in 14 days, or finance with Credova.
- Paperwork: Firearm Safety Certificate, DROS and California's 10-day waiting period apply. We handle each step with you at pickup.
- Questions: Call (619) 667-9453 or email sales@wbtguns.com. FAQ · California Rifle Compliance Guide
WBT Guns is family-owned in La Mesa, California, and has configured firearms for California buyers since 2012.
A note on accuracy. We work hard to keep every listing correct, but specifications, images and compliance details come from many sources and can contain errors or change without notice. Images may show a configuration that is not California-legal. If a detail on this page matters to your decision, call us and we will confirm it against the actual firearm before you order. The compliance information here is general in nature and is not legal advice; California and local laws change, and the configuration described is confirmed at the time of sale. All sales are subject to applicable federal, state and local law and to the buyer's eligibility to purchase.
