- Guarder Steel Slide Lock for G-Series Gen.3 Weight: 10g Color: Black Material: Steel SKU : GLK-72(BK) - Guarder Steel Slide Lock for MARUI G17/19 Gen.4 Weight : 4 g Material : Steel/Thermal Treatment Color : Black SKU : GLK-205(BK) AIP Steel Slide Part For Marui G17 Gen.3 Major Color : Black Built Material : Steel SKU : AIP-GK-05