I searched but couldn't quickly find anything directly on point.
Tomorrow night, I'm checking out (what the owner claims to be) a DDM4 v5 lw with only 100 rds through it. I'm fairly new to AR's, so I'd love some tips on how to look for issues like excessive wear and potentially replaced lpk's, bolt assemblies, etc.
I know I should be looking for proper staking and the gas ring test, but beyond that I'm pretty clueless.
Any pointers?
Thanks.


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