At some point the lug broke off, but remained in the barrel extension. Bolt cycled, but the broken lug prevented it from going into battery. Click, no bang, end of range trip
MPI will only pick up if there a fracture crack in the metal, not if the metal was not heat treated, the tempered correctly so the metal was not too brittle isntead (what was the problem and why the bolt lug sheared off.
If you get a hold of the bolt manufacturer, they will send you a replacement bolt for free. Hence the problem was the bolt was not heat treated, then tempered correctly, leaving the metal too brittle in the end.
Posted By PlaymoreMinds:
'Twas not the <cough> sweet and innocent <cough> PlaymoreMinds...
<---skips away in frilly skirts to Candyland, leaving gutters and snorkels FAR behind.