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The mech box on a TM MP5 does not need reinforcing if you upgrade the spring. The only way I've seen them crack, and same goes for me, is when an aluminum piston head is installed and the gun is fired in cold weather.
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“You hear the far-off crack of a rifle, your fate finally registering in your subconscious far too late as the white hot bullet penetrates your skull. Another round slams into the chamber even as your lifeless body falls to the ground…”---Unknown sniper
“Invisible souls leave .308 holes.”----USMC Recon Sniper
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