SIG SAUER MCX/MPX Folding Visor Rifle Stock Black. The hinge features the ability to lock the stock open in the deployed position. Specifications for SIG SAUER MCX/MPX Folding Visor Rifle Stock: Manufacturer: SIG SAUER Gun Type: Rifle Gun Make: SIG Sauer Gun Model: Sig Sauer MCX-SPEAR LT Sig Sauer MCX-SPEAR SIG Sauer MCX SIG Sauer MPX Color: Black Weight: 15 oz Package Contents: SIG SAUER MCX/MPX Folding Visor Rifle Stock SIG SAUER Infinite Guarantee What firearm models does the manufacturer say SIG SAUER MCX/MPX Folding Visor Rifle Stock is compatible with? The manufacturer says that SIG SAUER MCX/MPX Folding Visor Rifle Stock is compatible with SIG Sauer MPX SIG Sauer MCX Sig Sauer MCX-SPEAR Sig Sauer MCX-SPEAR LTSIG SAUER 8901412: MCX/MPX Folding Visor Rifle Stock Black