

The "Chart" is wildly inaccurate. Like totally inaccurate. Means 0.
Example- Bushmaster xm15 E2s ... I know these guns are not Nitro Proofed steel and there are 1/9 twist not 1/7 twist as well a 223 chamber not 5.56 etc... How do I know if the extractor,bolt, springs, and this, and that is all "good AR-15" quality??? There are so many to choose from???...LMT, RRA, STAG ARMS( modle 8 pretty cool), SABER, COLT, Bushmater etc ....? I know colt makes the mil stuff but is the ones civilians buy the same quality?
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