Haven't personally owned a bad one yet. I was however shooting a machinegun range back in February of 2011 and the M249 I was issued cycled 5 100 round belts flawlessly, halfway through the 6th the bolt head literally sheared off
In the weapon's defense it HAD been in the inventory since Desert Storm (the first go round) and quite possibly had close to a million rounds through it... and people say the military isn't asking for more money
NCO of Marines, 3rd Award Expert Rifle, 236 KD Range
D Co, 4th CEB, Engineers UP!! OEF 21JUN-20SEP2011
REV. 19:11 And I saw heaven opened, and behold a white horse; and he that sat upon him was called Faithful and True, and in righteousness he doth judge and make war.