Description
The HK MR556 A4 16.5 Inch CA 10 Round is a rifle chambered in 5.56 NATO with a 16.5-inch barrel and a 10+1 capacity. This configuration is listed by HK as: MR556A4, (CA Compliant) 16.5″ barrel, 1-10rd Magazine.
HK MR556 A4 16.5 Inch CA 10 Round Overview
The HK MR556 A4 is the civilian semi-automatic version of the HK416, using HK’s short-stroke gas piston system and a cold hammer-forged barrel.
Design and Features
HK builds its barrels by cold hammer forging, which produces a durable, accurate bore with a long service life. This version is configured for California compliance. It ships with magazines holding up to 10 rounds.
Handling in the Field
The MR556 is a premium rifle known for reliability in harsh conditions.
Action and Trigger
The two-stage trigger is crisp, and the AR-style controls will be familiar to any AR shooter.
Sights and Optics
Mount the optic of your choice with quality rings or a mount, and zero it with the load you plan to use.
The 5.56 NATO Cartridge
The 5.56 NATO and 223 Remington are light, flat-shooting, and easy to control, and ammunition is widely available and affordable.
Setup and Accessories
Start with a quality optic and solid rings or a mount, then add a sling for carrying and a bipod or shooting bag for steady rests. Test a few loads for accuracy and settle on the one your rifle likes best. A hard case protects your investment on the way to the range or the field.
Ownership Tips
Read the owner manual fully before your first range trip, and keep the manual, box, and receipt with your records for warranty service and resale. Unload the rifle and confirm it is empty before cleaning. Field-strip it according to the owner manual, scrub the bore with a brush and patches, and wipe carbon from the bolt face and chamber. Apply a light coat of quality gun oil to the contact points, and wipe the exterior with a lightly oiled cloth before storage.
State Laws
Magazine capacity limits, feature restrictions, and transfer rules vary by state and locality. Check your local laws before ordering, and ask your receiving dealer if you are unsure whether this configuration is legal where you live.
Ordering and Transfer
When you order a firearm from MAG5 Firearms, we ship it to the licensed dealer you choose. Your dealer completes the ATF Form 4473 and the background check, and may charge a transfer fee. Local buyers can complete the transfer at our shop. Bring a valid ID, and check your state waiting period before you plan a hunt or a range trip.
Safe Storage
Store the firearm unloaded in a locked safe or case, with ammunition kept separately. A cable lock or trigger lock is a good backup, especially in a home with children or visitors. Keep the original box and paperwork, and record the serial number in a safe place in case the gun is ever lost or stolen.
Your First Range Trip
Mount your optic, bore sight it, then fire your first groups at 25 yards before moving to 100. Let the barrel cool between strings, and record your zero and the load you used. Wear eye and ear protection, keep the muzzle in a safe direction, and clean the bore when you get home.
Specifications
- Model: HK MR556 A4 16.5″
- Configuration: MR556A4, (CA Compliant) 16.5″ barrel, 1-10rd Magazine
- HK ID Number: 81001033
- Caliber: 5.56 NATO
- Barrel Length: 16.5″
- UPC: 642230269422
Before You Buy
Federal law requires firearms bought online to ship to a licensed dealer, and buyers must be 18 or older to buy a rifle from a dealer. We ship to the FFL dealer of your choice, and your dealer handles the background check and transfer.
Who It Is For
The HK MR556 A4 16.5 Inch CA 10 Round is a great fit for hunters and target shooters who want an accurate, dependable rifle from Heckler & Koch.
Buy the HK MR556 A4 16.5 Inch CA 10 Round at MAG5 Firearms
MAG5 Firearms is a family-owned FFL in Collegeville, Pennsylvania. Order the HK MR556 A4 16.5 Inch CA 10 Round online and ship it to your local FFL dealer, or browse our full selection of firearms for more rifles. For factory details, visit Heckler & Koch.
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