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Hi Timothy and welcome. Yes Sir, Frame Material is Aluminum. Cheers and stay safe!

The Rock Ultra CS Lightweight pistol is built in traditional 70 series design with an aluminum frame and delivered with our precise engineering standards and first rate upgrades. This pistol is chambered in 45ACP with 3.62" button rifled barrel supported by a full length guide rod. Includes a dovetail fiber optic front sight and LPA MPS1 type adjustable rear sight. Also include skeletonized hammer and trigger with adjustable over travel stop, which comes standard in the Rock series. The Rock Ultra CS-L is finished with a tough parkerized coating and G10 tactical grips. True to all Rock Island 1911s the Rock Ultra comes with a crisp factory 4- to 6-pound trigger to give you a great experience right out of the box.

ye it is the aluminum frame "The Rock Ultra CS Lightweight pistol is built in traditional 70 series design with an aluminum frame and delivered with our precise engineering standards and first rate upgrades. This pistol is chambered in 45ACP with 3.62" button rifled barrel supported by a full length guide rod. Includes a dovetail fiber optic front sight and LPA MPS1 type adjustable rear sight. Also include skeletonized hammer and trigger with adjustable over travel stop, which comes standard in the Rock series. The Rock Ultra CS-L is finished with a tough parkerized coating and G10 tactical grips. True to all Rock Island 1911s the Rock Ultra comes with a crisp factory 4- to 6-pound trigger to give you a great experience right out of the box." https://www.armscor.com/firearms-list/rock-ultra-cs-l-45acp-7rd

Hi Tim, yes sir, The Rock Ultra CS Lightweight pistol is built in traditional 70 series design with an aluminum frame and delivered with our precise engineering standards and first rate upgrades. This pistol is chambered in 45ACP with 3.62" button rifled barrel supported by a full length guide rod. Includes a dovetail fiber optic front sight and LPA MPS1 type adjustable rear sight. Also include skeletonized hammer and trigger with adjustable over travel stop, which comes standard in the Rock series. The Rock Ultra CS-L is finished with a tough parkerized coating and G10 tactical grips. True to all Rock Island 1911s the Rock Ultra comes with a crisp factory 4- to 6-pound trigger to give you a great experience right out of the box. Stay safe & have a great day!