I'm not sure about this question. The 945 has a frame mounted safety just the same as a 1911.

The drum is no longer a turnable manual safety but is an insert to retain the firing pin unlike the 1911 firing pin stop. The drum is now flat on the top and bottom so it cannot rotate.

As far as the issue of frame peening on my 639 I have found the steel to be very soft and malleable. Over the years the top of the frame has peened and at one point the frame lug on the left moved enough metal upwards that I had to file it down. It never raised after that and accuracy seemed to improve which was not expected.

This was years before there was a SWF to learn from about proper lubrication and regular recoil spring changes.

I hope that the newer guns have harder steel unlike the soft stainless in my 639.

I have included some photos of the 945,745 and 639 frames and recoil springs and guide rods.. The 945 has a longer plunger and a thicker bushing not found on the other guide rods.

Then there is the Briley bushing another departure from the 1911 barrel bushing.



As you can see in the photo the 639 frame has been a bit battered while the 745 and 945 appear as new even after more than 15 years of use.

Change the springs, use grease everywhere there is contact and they will outlast their current owners.

Bruce

I found my purchase receipts and the 639 was purchased in 1983 the 745 in 2000 and 945 in 2002