400e Air Rifle Parts

Match the kit to your body type. The 400e Metal Barrel Kit fits Gen 1 and Gen 2 Metal rifles, which use a 405mm barrel. The 400e Polymer Barrel Kit fits the Gen 2 Polymer, which uses a 357mm barrel. Each comes in Standard or Precision. The Standard barrel handles a wider range of steel BBs, while the Precision barrel is tighter and more accurate, and works best with Barra zinc-plated .177 BBs.

The 400e uses a 3S (11.1V) LiPo battery rated 25 to 35C with a Deans (T-plug) connector, stored in the buttstock. The 11.1V LiPo replacement is 2200mAh and 35C, and the charger is sold separately. Charge only with a LiPo balance charger, and check the pack for swelling before use. A battery voltage alarm warns you before the cells drop too low.

Swap in the 400e Main Spring Light Version. It drops velocity to standard BB gun levels of about 275 fps, which makes the rifle quieter and easier on your backstop. The 400e's Quick Change (QC) feature makes spring swaps easy, and there is a video on the product page that walks you through it. To go back to full power, reinstall the standard 400e Main Spring.

You can, but contact customer service before you buy. A jammed gearbox is usually easier to swap than to rebuild, and the replacement gearbox fits the 400e Gen 2 Metal and Polymer. It takes some disassembly, so make sure you have the right tools. The same goes for the ambi-switch gear set that runs the fire selector, which can be tricky to install.

Spare magazines and BBs cover most needs. The 400e takes 50-round and 100-round magazines that hold .177 steel BBs only, and the BB Speedloader Gen 2 holds up to 200 BBs and loads 5 per push. Keep a supply of zinc-plated .177 BBs, especially if your rifle has the Precision barrel. If your buffer tube feels loose, tighten the Phillips screw at the bottom of the tube first.