Hello. It's not the frame that has potential problems in the Hi Power as much as it is rounded locking lugs from what I've seen. I've seen a couple of cracked slides in heavily-used early IPSC Hi Powers, but the shooter was trying to make major with 9mm handloads. Mk III Hi Powers are beefed up at the lower rear of the ejection port where these cracks were observed. Almost everytime I've seen either, it has been when the pistols were:
A. Heavily used with standard pressure loads over years
B. Used regularly with +P ammunition
C. A&B + having a pretty weak recoil spring that felt even below factory standard at 17-lbs.
Whether the SIG-Sauer is any better I flat cannot say. The SIG-Sauers that I have seen broken over the years were usually from cracked slide rails.
The last time I checked SIG-Sauer did not endorse +P in their autos, but many use it pretty frequently.
Best.
A. Heavily used with standard pressure loads over years
B. Used regularly with +P ammunition
C. A&B + having a pretty weak recoil spring that felt even below factory standard at 17-lbs.
Whether the SIG-Sauer is any better I flat cannot say. The SIG-Sauers that I have seen broken over the years were usually from cracked slide rails.
The last time I checked SIG-Sauer did not endorse +P in their autos, but many use it pretty frequently.
Best.