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Dean, Buds Customer Service will need to confirm this with their Inventory Dept. at 1-859-368-0371 9am-9pm EST Mon-Fri. or use the Blue Chat now button at the bottom right corner 9am to 9pm Mon-Sat and 11am - 7pm Sun (7 days a week). Del-ton Customer Service may answer quicker at Phone: 910-645-2172 8:00am - 5:00 pm EST Monday - Friday

Dean, Weather the lower is marked multi-caliber or not the AR lower can be used with different caliber uppers from 22 lr to 6.5 rounds no problem.