Convert 40 to 9?

[Bantam1]

I would see if you can find schematics for the M&P. It should show a different part number if they are using a different extractor for 9 and 40. It should be a simple swap if they are different and one can be obtained.

 

[Rookie]

That and a new extractor retainer roll pin that I boogered before I had roll pin punches.

 

[Rookie]

To update, I now have 450 trouble free rounds through the 9mm conversion.

 

[Baron23]

Hi guys - I'm not a pistol shooter by any stretch...so, maybe help me understand a bit....why is 40 S&W no longer commonly used?

Are there general issues with this round or just want to shoot a perhaps less expensive round?

 

[Maser]

Hi guys - I'm not a pistol shooter by any stretch...so, maybe help me understand a bit....why is 40 S&W no longer commonly used?

Are there general issues with this round or just want to shoot a perhaps less expensive round?

The selling point for the .40S&W was that it was the best of both worlds with the knockdown power of a .45ACP and magazine capacity of a 9mm. Nowadays there's plenty of large capacity mags for the .45ACP so people just get a .45.

 

[Rookie]

When I left the PD 12 years ago most every cop in the country carried a 40. Now almost noone does. Some say its because improvements in bullet technology made the 9mm as effective as the 40 with less recoil and more capacity for ammo. I would argue that same technology made the 40 more effective as well.

 

[iceng]

Rounds down range. In the same physical size magazine you can get more rounds of 9mm than 40.

Bullet / cartridge tech has changed, yes that also makes 40 or 10mm or 45 better, however 9mm now would be very close to what 40s&w when it first came out ?

I put it mostly to physical rounds in the mag.. for when you get assulted by acorns. Return fire, mag dump, more return fire.

 

[DOA]

To update, received the 9mm mag today and hit the range. 9mm swap works perfect with defensive rounds and my crummy reloads. POI=POA. So cal swap for $170 beats $600 for new gun. Plus the versatility of 1 gun, 2 cals.

I did that to my old duty Glock 22. Changed to a LW 9mm conversion barrel and 9mm mags and its been 100%.

 

[Ronws]

My LTC instructor answered the question about which round is most effective.

He said, "I have a .380, a 9 mm, and a .45. Which one do you want me to shoot you with?"