Replacement floorplate set to increase the capacity on Sig Sauer factory P320 full size 9mm magazines only. – Contains: – 1- Polymer Plus-2 magazine extender – 1- Phosphate steel locking plate heat-treated – Mec-Gar IFS+- Innovations For Shooters is the ultimate range of advanced upgrade parts straight from Mec-Gar R&D Department. Made in Italy with the most sophisticated technologies and the best materials all items are thoroughly quality tested to guarantee uncompromised performance and reliability. – Manufactured from durable poly carbonate locking plate made with heat-treated phosphate steel. Replacement floorplate and inner base set to increase the capacity on Sig Sauer factory P320 full size 9mm magazines.