Quality hmc in Johnson 7.5 help!

[dewcrew8]

Ok I was giving this rifle from my dad and he thought it was just a 30cal, but when I trying shooting it it won't feed, took it to gun smith and it now tells me it's a Johnson barrell. So would I change out barrels or not ? The only thing I don't like when I took it apart to see what parts were in it there lots like they had to grind some metal. sorry 5.7

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