When I fired my M&P15 for the first time I was extremely pleased with how tight the action felt and sounded. I was used to M16a2s in the Marines that were wore out and rattled, so my M&P15 felt like a fine tuned ferrari. As noted above I to was impressed at the distinction of feel when the magazine was empty and the bolt locked back. Also I noticed how easy the pins holding the upper and receiver together pulled out, I expected it to be tighter and harder to pull out but my rifle seems to be tight with no problems.
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