Heckler & Koch (Germany) continuous to take us by surprise and release news like no other company. They just upload a new rifle to the homepage and...tell no one. They seem to hate journalists too and make our life as hard as possible.

Just how long the HK233 and HK233K information has been online is unknown. It could be weeks, days or seconds. If you know when HK launched these rifles please share in the comments section below.

The good news is that The Firearm Blog seem to be the first ones to report about the HK 233 and HK 233K. Google is quiet apart from HKs own homepage. I have checked with several of my sources and they have never heard of either of these models.

The “K” most likely stands for “Kurz” which means short. With a barrel of 12.5″ it is quite shorter than the normal 233 at 18.9″.

The operating principle is described as “gas-operated”. This leads to think that the HK 233 might be direct impingement, but I am sure they are short stroke piston.

The HK 233 shares a lot of its looks with the HK243 S SAR (or TAR) Semi Automatic Rifle, Sporter Basic Variant for the civilian market.

We wish we had more information but this is what is known:

HK233 The HK233 is a modular and compact assault rifle in cal. 5.56 mm x 45 NATO with increased performance on the basis of the worldwide proven G36.

Features Fully ambidextrous weapon operation for both right-handed and left-handed shooters

Slim Line handguard and upper receiver with STANAG 4694 profile at 12 o’clock position. MIL-STD 1913 Picatinny rail on 6 o’clock position

Foldable, retractable buttstock with height-adjustable cheek rest. Weapon can also be used with the buttstock in the folded-in position

Tool-free assembly/disassembly of the main assemblies

Wide variety of accessories available, such as training bolt group, bayonet, suppressor, drum magazine, brass catcher, blank firing attachment, forward grip, bipod and more

Mounting of optical sights (3x) and reflex sights (1x) on sight rail possible HK233 | Technical Data

General Calibre 5,56 mm x 45 Operating principle Gas-operated Magazine capacity 30 rounds Modes of fire 0-1-D Rate of fire approx. 750/min Sights M, O Buttstock R, FO Dimensions Length min./max. approx. 755/975 mm Width approx. 64.0 mm Height approx. 261.0 mm Barrel length approx. 480 mm Weight Weapon approx. 3,880 g Magazine approx. 140 g

And onward to the shorter model, with around 12.5″ barrel.

HK233K The HK233K is a modular and compact assault rifle in cal. 5.56 mm x 45 NATO with increased performance on the basis of the worldwide proven G36.

Features Fully ambidextrous weapon operation for both right-handed and left-handed shooters

Slim Line handguard and upper receiver with STANAG 4694 profile at 12 o’clock position. MIL-STD 1913 Picatinny rail on 6 o’clock position

Foldable, retractable buttstock with height-adjustable cheek rest. Weapon can also be used with the buttstock in the folded-in position

Tool-free assembly/disassembly of the main assemblies

Wide variety of accessories available, such as training bolt group, bayonet, suppressor, drum magazine, brass catcher, blank firing attachment, forward grip, bipod and more

Mounting of optical sights (3x) and reflex sights (1x) on sight rail possible

HK233K | Technical Data

HK233K – CAL. 5.56 MM X 45 NATO

General Calibre 5,56 mm x 45 Operating principle Gas-operated Magazine capacity 30 rounds Modes of fire 0-1-D Rate of fire approx. 750/min Sights M, O Buttstock R, FO Dimensions Length min./max. approx. 593/813 mm Width approx. 64.0 mm Height approx. 261.0 mm Barrel length approx. 318 mm Weight Weapon approx. 3,600 g Magazine approx. 140 g

Check Heckler & Koch’s homepage for the HK 233 model.

And YES, we have noticed that the HK 337 is online too and will be writing about it very soon.

With a 8.9″ barrel in .300 Blackout it looks rather nice. Until then check here.

I guess I am not the only one who will have a very hard time trying to remember and distinguish all these HK models apart.