Sure thing Mick.
The only other thing I would look into for your Bushmaster is inspecting it for a properly-staked Bolt Carrier Key and staked Castle Nut (if you have a collapsing stock).
Check out this thread on carrier key staking, and what a properly staked key should look like:
https://www.m4carbine.net/showthread.php?t=6993
You should be able to do a search on this and the castle nut staking issue for more info. I know that Grant at G&R Tactical, who also belongs to these forums, is a BM dealer and might be able to take care of this for you.
On the Mag issue, I wouldn't worry about it. I'm not sure how reliable the Bushmaster-brand magazines are these days. About 10 years ago I had one of their 10-rounders (from the Clinton "ban" days) and it was junk. Anyways, just pick up some P-Mags and you'll be all set. As for lube, just use whatever works best for you. Perhaps try a few quality brands that have already been mentioned above, eventually you'll figure out what you like. Some people even use 10w30 motor oil with some success.

There are a bunch of other threads on this topic if you want to look into it more. I use Slip 2000 for everything.. Handguns, rifles, shotguns.
Go shoot your rifle and let us know how it does.
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