I broke mine while wolverine was still the importer. Had one sent out and tried to install, ended up it was a firing pin meant for a 7.62 rifle, as it did not fit. Wolverine offered to try to track down a legit 5.56 firing pin but I just spent $25 to have a local smith machine it to fit. approx. 1300 rds later and no more issues. Just to give you the heads up that a 5.56 specific firing pin may be difficult to find...