[7] The Type 20 was seen overseas for the first time in Operation Talisman Sabre, which took place from July to August 2023 with the ARDB.

Since all three rifles satisfied the JGSDF's requirements, the Type 20 was selected due to having the highest score based on the second evaluation.

[15] One key difference it has over the Type 89 is the addition of multiple rails, making it the first Japanese rifle to have this feature as a standard design.

[16] The rifle features a telescoping stock, vertical forward grip, an ambidextrous safety selector, and operates via short-stroke piston.

The barrel length has been shortened slightly and the hand guard has been redesigned to feature an M-LOK rail design.

[17] The side rails have been extended, foldable iron sights were added and the stock features a shoulder pad similar to the one seen on the HK416.

As such, the design of the Type 20 has been compared to the Heckler & Koch HK433;[16] with some observers believing the rifle possesses similar dimensions and functionality to the SCAR.

[17] Another design influence is speculated to come from the experience Howa has gained from developing the ACIES variants of the Type 89.

It weighs 12 g (0.4 oz) and is made from steel and red brass using double-base powder propelling a bullet with a monolithic, high-strength material core.