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 will be be CNC machined from aerospace grade aluminium and will be mil-spec type III class 2 anodized matte black.
The B&T MBT buttstock can be found here.
US customers please order your stock at BT-Parts.com and your adapter at JDI Firearms Inc.
Made in the Netherlands