1911 Mainspring Housing, flat, for full size Government Model, Commander and clones. Machined from aluminum bar stock. Does not include main spring or internal parts. A great choice if you're trying to cut some weight from your 1911 build or upgrade your polymer mainspring housing.

*Does NOT fit Officer's Model, Defender, Bobtail and other 1911 model with shortened or modified frames.

Typical MSH weights for comparison:

• Steel, flat: 1.6 oz
• Aluminum, flat: 0.6 oz
• Nylon, flat: 0.3 oz