Nishimura decides it is time to maintain their CA870 airgun after neglecting it for about three years. The motivation for this sudden productivity comes from a noticeable drop in power and a trajectory that has become quite unpredictable. To fix these issues, a new hop-up rubber and a fresh spring are prepared for installation, with a goal to return the equipment to its former functional state.

The Maruzen CA870 TAC10 airsoft shotgun that Mack Sakai reviews is a 2026 reissue, maintaining its reputation as a compact and lightweight option for players. He notes its updated features, including M-LOK rail compatibility for those who enjoy attaching lights and gadgets until the gun is barely visible. At about 1.4kg, it is easy to handle, though the front sight requires a bit of DIY involving double-sided tape and a steady hand.

Yo-san chatters away on the  Maruzen CA870 Setagaya Base Rough Stock Kit in this video. The Maruzen CA870 is a popular choice for airsoft fans, and the stock kit, a limited-release accessory that is currently harder to find than a quiet spot in a busy city.

Mach Sakai reviews a unique collaboration between Maruzen and George Tokoro: the "Arakure" (Rough) Stock Kit for the CA870 airsoft shotgun. The kit features a stock that looks like it was hacked off by a rugged survivalist in a hurry, complete with visible screw holes and a deliberately unpolished finish. It’s the perfect accessory for anyone who wants their high-tech airsoft gun to look like it barely survived a scrap metal yard.

The PDI-Japan 230mm 6.01 inner barrel for the Maruzen CA870 series is constructed from durable stainless steel (SUS304). The company says its exceptionally tight 6.01mm inner diameter is engineered to minimize air loss, resulting in excellent momentum transfer for the BB as it's propelled forward. This characteristic makes it optimally suited for short-range engagements, such as those encountered with pistols.

Most, if not all, of the Maruzen CA870 Series in one video by Mokei Paddock dues to a special request by a viewer. They do a comparison of these airsoft shotguns such as the CA870 Charger, CA870 Stock, CA870 Bulldog, and the CA870 sawed-off and airsoft players can decide which fits their playing styles.

Mach Sakai revisits the Maruzen CA870 Sawed-Off Airsoft Shotgun which he reviewed previously. This is a spring-powered replica based on the Remington 870 shotgun. It features a pump-action mechanism that fires a single BB per pump, and has a magazine that holds 40 rounds. The airsoft shotgun is made mostly of polymer with a metal trigger and trigger guard, and has a plastic handguard and pistol grip with wood texture.

Another Maruzen airsoft shotgun for Mach Sakai to test and it is the venerable CA870 Bulldog. The Maruzen CA870 Bulldog Airsoft Shotgun is a spring-powered, pump-action airsoft gun, is a compact magazine-fed replica inspired by the Remington 870. It fires one 6mm BB bullet at a time from its 40-round polymer magazine. The gun features a polymer receiver and outer barrel, along with a plastic handguard and pistol grip that have a wood-like texture.

For owners of the Maruzen CA870 Airsoft Shotgun, Nishimura put together this video as a helpful guide in doing maintenance or repairs... "Hello, this is Nishimura. This video explains how to disassemble and maintain the CA870. For reference of spring replacement and hop packing replacement such as Nonbain.

Required tools:

Mach Sakai checks out one of the variants in the CA870 airsoft shotguns series made by Maruzen, the CA870 Sawed-Off shotgun. It is a pump-action airsoft shotgun with a nylon fibre material and faux wood finish. Maagazine has a capacity of 40 BB rounds and also has a hop-up. This is available at reputable airsoft sellers worldwide.