Henry Supreme question

New to Henry and recently bought a Henry Supreme in 5.56. Noticed when I took it home that when I shake the rifle there’s a noticeable rattling sound that occurs with this movement. However, when I inserted the supplied Pmag the rattling noise became less pronounced but was still evident. Is this mainly due to the AR style bolt carrier group?

Also felt like the buttstock is easier loose or not seated as it also tends to “wiggle” slightly. Was just wondering if it’s safe to shoot and if I should expect a break in period with this rifle? Did reach out to Henry about it so hopefully I get word back soon. Thanks for the help!