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cneider · 10-08-2013, 05:23 PM

OK. Here's a follow-up, four months later. I slipped the 9mm upper that Dad brought home from WWII on the .30 Luger 1920's alphabet series commercial lower that I recently inherited. It slipped on easily enough, no binding or excessive play. I see what you meant about these pistols being hand fitted. I also tried installing the trigger, takedown lever and sideplate that Dad brought home with this upper. They binded (bound? JAMMED!) So I kept with the original commercial parts.

Next, I hand cycled a magazine full of 9mm ammo through it. No Problem!

Today, I took it to the range and gave it a dance. First I fired some .30 Luger (gun show reloads, uh-oh!) through it. One stovepipe and a failure to lock open on the final shot. Then I changed uppers and fired my own 9mm reloads (115 gr FMJ factory duplication loads) through it. Another stovepipe, but overall, the same results as the .30 Luger. So maybe I don't need to change mainsprings to fire 9mm after all?

One thing I noticed when firing both calibers: some times the trigger had a sweet pull and release, other times I had to squeeze it all the way to the stop AND THEN SOME! What's up with that?

G.T., do you want to weigh in on this?

10-08-2013, 05:23 PM	#7
cneider User Join Date: Jul 2003 Location: Phoenix, AZ Posts: 59 Thanks: 28 Thanked 1 Time in 1 Post	OK. Here's a follow-up, four months later. I slipped the 9mm upper that Dad brought home from WWII on the .30 Luger 1920's alphabet series commercial lower that I recently inherited. It slipped on easily enough, no binding or excessive play. I see what you meant about these pistols being hand fitted. I also tried installing the trigger, takedown lever and sideplate that Dad brought home with this upper. They binded (bound? JAMMED!) So I kept with the original commercial parts. Next, I hand cycled a magazine full of 9mm ammo through it. No Problem! Today, I took it to the range and gave it a dance. First I fired some .30 Luger (gun show reloads, uh-oh!) through it. One stovepipe and a failure to lock open on the final shot. Then I changed uppers and fired my own 9mm reloads (115 gr FMJ factory duplication loads) through it. Another stovepipe, but overall, the same results as the .30 Luger. So maybe I don't need to change mainsprings to fire 9mm after all? One thing I noticed when firing both calibers: some times the trigger had a sweet pull and release, other times I had to squeeze it all the way to the stop AND THEN SOME! What's up with that? G.T., do you want to weigh in on this?