Would you think that if someone swapped out the guide rod, that they most likely beefed up the spring also, to not have to worry about firing the hotter loads? I know its a guess.
I would never put my faith in someone else. Recoil springs are cheap, new frames and slides are not. For all you know he was shooting 40 S&W level loads out of it and had a lighter spring. Better to err on the side of caution imho
Ditto. I would toss the full length guide rod and replace the recoil spring with the correct weight for the 10mm. The parts needed are common and very cheap, and as already stated, frames and slides are not. Never trust someone elses tinkering.Right. That Delta has an unnecessary part. The ill-famed full length guide rod. Necessary only for extracting money from a shooter's wallet and making takedown harder.