Well, since ya asked............
From what I have seen and handled at the range, the KelTech carbine is pretty flimsy, and looks cheap.
For a M1 Carbine, I would just find a good USGI one. I have several, one is a RockOla that I bought for $40. so bargains are out there.
I like my Mini-14 a lot. I have 10 new 20 round mags still in blister packs, and 6 shooters. I have a number of PMI 30 round mags that function perfectly. My Mini is bullet proof, no problems at all. Like the Energizer Bunny, it just keeps running, and running, and running.............
To Recap:
I would buy a Mini-14, skip the Keltech, and find a GI carbine.