Jacob Grey Firearms Main Spring Housing Titanium. Our 1911 Titanium Mainspring Housing is just another fine example of the craftmanship and superior quality that goes into Jacob Grey Titanium parts. The checkered serrations on this mainspring housing help get the weight in the right place and gives you great traction. Pins and springs do not come with this part. You can use the pins and springs from your original mainspring housing or purchase new parts to replace your old. This titanium mainspring housing makes a great replacement for plastic or aluminum mainspring housings. This is our premium mainspring housing designed and made by Jacob Grey. Fully machined from 6AL-4V Titanium. The Jacob Grey Titanium Mainspring Housing will fit standard 1911 Government and Commander frames it will not fit STI's or short grip frames. All Jacob Grey 1911 Machined parts have been fully CNC machined from solid steel billet. We never use cast metal injected moldings forged or polymer parts. To create the Worlds Finest 1911s only the best materials can be used. That is why you can trust Jacob Grey Firearms parts in your 1911. Specifications for Jacob Grey Firearms 1911 Main Spring Housings: Manufacturer: Jacob Grey Firearms Color: Black Finish: Unpolished Fabric/Material: 6AL-4V Design/Pattern: Checkered Gun Make: 1911 Platform Gun Model: 1911 Quantity: 1 Package Contents: Jacob Grey Firearms 1911 Main Spring Housings What firearm models does the manufacturer say Jacob Grey Firearms 1911 Main Spring Housings is compatible with? The manufacturer suggests that Jacob Grey Firearms 1911 Main Spring Housings is compatible with 1911Jacob Grey Firearms 1911MSHTI: 1911 Main Spring Housing Titanium