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I am building an AR and have a local gun store stripped lower made by Matrix Arms and a Wilson Combat WC-15F stripped lower. I have a Colt lower parts kit / fire control group and a Colt LE6920 complete 16inch upper. I think Matrix makes the Ruger ar556 lowers. Any reason one lower would be better than the other for the build?
Not really. Could be some tolerance that are better than others.
I have a Wilson upper and lower and it's great. Pick whichever you like the looks of better.
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I'm to the point I'm skeptical of anything that doesn't get individually inspected by the company that sells the product. Among your choices, I'd consider Wilson Combat for the neatness factor.
Most of my builds, not done on 80% lowers, are done using Wilson Combat Lowers. They are clean and in spec, I'd go with Wilson Combat based on my personal experience.