HOWA was going to make an improved version based on the AR180 as the next official rifle, but problems arose, so a new development was made and the Type 89 rifle was created.
Although it is a newly developed rifle, it has many similarities with the AR180 and can be considered a kind of derivative.

HOWA Kogyo had been producing and exporting the AR180 under license and delivering modified models to the Self-Defense Forces.
Production by HOWA Industries was discontinued when it was discovered that radicals in Northern Ireland were using Japanese-made AR180s.

Following the Type 64 and Type 89, the Type 20 has a gas regulator. Details are not known, but it is small and stylish.

There is a Picatinny rail on the top of the handguard and M-rocks on the sides and underside for perfect expandability.

The Type 20 rifle is similar in many areas to the AR15 and SCAR, making it modern and superior for use in Japan's remote island defense applications.

The Type 06 rifle grenade has a mechanism that combines a bullet trap and a separate flight system.
All grenades were designed and manufactured in Japan because foreign-made grenades were dangerous due to flying fragments when fired. It also has a self-destruct function in case of malfunction.

The left selector, which became standard equipment after the Iraq deployment, has the disadvantage of being poorly positioned and out of reach of the thumb. It is like for left-handed shooters.
A rubber tube is attached to prevent the fixed pin from falling off.

The selector on the Type 89 cannot be short-circuited from safety to semi-automatic, which is a drawback.
The right side selector was designed to prevent accidental operation during crawling, but after the deployment to Iraq, it was also equipped with a left side selector.

The Type 89 rifle has a gas regulator following the Type 64. Gas pressure is determined by the number of holes, and the basic setting is 2. It is screwed in, and if the stage is ignored and tightened to the end, the gas block is completely closed and will not blow back.
The second photo is a replica

Unlike the M4, the bolt catch (slide stop) on the Type 89 rifle is raised when the hold is opened and released by pushing down. However, since the bolt release is supposed to be done by operating the bolt handle, this slide stop was not originally designed as a bolt release button.

Gun control in Japan is particularly strict with handguns.
Firearms that have been destroyed as designated by the police can be legally possessed, but handguns are not easily distributed.
As you can see in the picture, it is perfectly destroyed, but now it is much stricter. This is from the old days

This is a 9mm machine pistol, but the selector and other design features have been changed, and it is a copy not licensed by UZI.
When we interviewed an active SDF officer, he told us that he had not seen any of these in his armory recently.
Most have probably been decommissioned.

The SIG P220, adopted under the name of 9mm pistol, is machined unlike the original, so the edges of the corners are sharp and cool. Engraving patterns are available in Ground, Maritime, and Air Self-Defense Force specifications.
Recently replaced by H&K's SFP9, the number is expected to decrease.

　The JGSDF "MINIMI" was produced by Sumitomo Heavy Industries under license from FN. Each part of the Japanese-made Self-Defense Force model differs from the original. Sumitomo withdrew from the business and in recent years began importing the latest models from FN.

The Type 20 is the latest rifle from the Japan Self-Defense Forces, and has won comparison trials with the FN-SCAR and HK416, making it as modern as any gun in the world.
It is designed with remote island defense in mind, making it easy for seawater and other liquids to escape, and rust-resistant.

We also have to protect the honor of U.S.army.
They can build a beautiful sandbag building if they are serious too, right?

Japan Ground Self-Defense Force's Sandbag Construction is Battlefield Art.

There are more pictures in the reply section.

Comparison of military organizations of different countries in the way sandbags are stacked

Russian Armed Forces
Polish Armed Forces (Navy)
Japan Ground Self-Defense Force
U.S. Armed Forces