Semi automatic bolt kit for the SUOMI 31 

This closed bolt system works extremely well and eliminates the problems of kits offered by other companies. The bolt is new made and designed specifically for semi auto use and is NOT a modified full auto bolt.

You will need this kit, our reduced ID tube (S31T-RID), 16" barrel (S31B16), and an original parts kit-preferably with an intact trigger housing 

This kit comes with a build guide.

You may need additional USA made parts to be 922R compliant. A barrel extension does not come with this kit. You will have to obtain a 16" barrel or barrel extension, or submit the required paperwork to the ATF before beginning. This design has been approved by the ATF.

Note: We recommend using a parts kit with an intact trigger housing.