Why does your 12 ga auto Charles daly jam on the last shell?

A 12-gauge Charles Daly auto shotgun may jam on the last shell due to several factors, including weak ammunition, insufficient lubrication, or a dirty or worn magazine spring. The last shell can sometimes fail to feed properly if the follower is not moving smoothly or if there is a buildup of dirt and debris. Additionally, issues with the extractor or ejector can cause failures to eject properly, resulting in a jam. Regular maintenance and using high-quality ammunition can help reduce these issues.