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I am thinking about purchasing a lapping tool and compound for putting together a 300 blackout . Is it really necessary ? Will I see a difference in accuracy? I am thinking it will be a one and done so wondering if it is worth the purchase. The upper and lower is AR precision M4 E1 . I am...

Anyone do class with these guys? I did one last week and it was awesome. Learned a lot in a two hour session. Just curious . thanks, Richard Rollins