Upgrade your plastic spring guide with the FPS Ergal ball-bearing spring guide for the TM Next Gen M4/HK416 series.

Made from aerospace-grade aluminium and anodised for a smooth finish, this will withstand the increased load in upgraded builds.

The ball bearings on this model will reduce rotational tension on the spring when used in conjunction with a bearing piston head. The shape of the rim is compatible with most springs.

FPS parts are designed and manufactured in Italy.