A friend is having trouble with a Colt series 80 commander occasionally light striking and not setting off primers on the first attempt. He's had a local gun smith try resolving the issue. They've replaced the mainspring, firing pin, firing pin spring, and finally the barrel. It's still doing it, just not as frequently. I've noticed that all his primer strikes are way off center, but some are so light I'm surprised they went off, and some are nice deep ones that look like you'd expect a struck primer to have. While examining his gun, the only odd thing I noticed was it is a series 80, but the FP safety plunger is gone as is the plunger lever. From a bit of googling, it seems like this isn't so unusual, and is commonly done by people who think you can't get a good trigger out of a series 80. He says he didn't do it and has no idea who did. He's the original owner, but has had several shops work on it over the years. Assuming the FP safety parts having been removed has nothing to do with it, what else might cause this? The ammo being shot is factory new, Winchester and Federal...whatever he finds at Walmart.