M4 retractable stock tube

A buffer tube for M4 and related types weapons. On the contrary of the standard buffer tubes, this one contains a recoil unit. There is a weight with a spring inside. It's pushed by a rod using the energy of the piston, so that it moves inside the tube when firing, so the weapon "kicks."

Attention, it does not fit standard AEG M4 receivers - it's necessary to use a receiver with an inner thread instead of the buffer tube guide. We recommend to use the Shooter receiver - we offer it, SKU: 7482.

The receiver end plate and a quality metal, ball bearing spring guide are included. It's necessary to replace your original spring guide with this one.

The parts should be installed by an expert.