I have a lefty as well. It sits in a T3X CTR LH stock. just beware the bottom metal is a little wider on the CTR so some gaps are visible around the edges.
As for plastic mags I just ordered a Metal 15rnd mag for the T1x from NDr Shooting Supplies who manufactures them in Alberta. Not a site sponsor but they make some solid products I have a mag for my T3X that is currently my go to. I use it on my switch barrel rifle and run both 6.5 PRC and 6.5x55 Swede out of it.
So I am expect the T1X mag to be the same high quality.
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Cheers,
B
I ordered one from NDR (Nelson) plus a metal mag for my T3X in 222. Have some of his mags for the 243/308 and they are great.