The CSR Precision B&T MBT buttstock adapter will mate the ACR inspired B&T MBT buttstock to your SIG SG550, SG551, SG552, SG553, SG556 or SG522. The telescopic buttstock with cheekriser will give you a lot of additional adjustabilities, so you can configure the rifle to you very own needs.
The hinge has a built in locking mechanism, making sure the stock stays folded when it has to while maintaining all operational features. A stainless steel pivot pin will be provided with the adapter, spring is included with the MBT stock.
The adapter is CNC machined from aerospace grade aluminium and mil-spec type III class 2 anodized matte black.
The B&T MBT buttstock can be found here.
Pre-order: new production batch is underway, shipping end of January 2025
US customers please order your stock at BT-Parts.com and your adapter at JDI Firearms Inc.
Made in the Netherlands