Howdy yall.
I am entirely ignorant to rifles, shotguns, and anything other than M4 and M16 I carried in the Army.
I know a lot about weapon safety, but am sure I can alway pick up a trick or two.. Never too safe.

I am in the process of purchasing a 2001 year model 111 .270. It 100% original and comes with an optic that will suffice for my first hunting season.

When I go to these online retailers how do I know what will fit my new to me rifle? Are there any brands or retailers to stay away from? (No need to bash and I couldnt tell if asking about best/worst retailers is allowed in the forum rules).

Is the 2001 year model 111 .270 able to be converted to a magazine style like the new ones with that, reportedly, terrible accutrigger?

Any tips, tricks, or advice is greatly appreciated.

Also, I did my best to search the forums before posting. I followed the tips of using 3-4 words. Tried with quotes and without.