Jump to content

Sig P239 40 S&W Mod

Spurshot

By Spurshot
in The Off-Topic Bar

Recommended Posts

Spurshot Senior Enthusiast

Spurshot

Posted
Posted

Being a former gunsmith, a machinist/toolmaker, and engineer, I have a insatiable appetite for modifying things. In some other posts, I installed a Sig (OEM) Short Reset Trigger group to help the single action trigger function, as well as a full length steel guide rod.

 

Since I don't do concealed carry with my P239 40 cal, I wanted to do an extended magazine to gain capacity over the standard 7 round single stack. My wife has begun using it for her shooting, since it fits her hands better than the P226 double stack.

 

I looked at the Sig website for an extended magazine. They do one for the 9mm P239. Nothing for the .40 S&W P239. So, I thought I'd buy a 9mm 10 round extended magazine and see how they did it and if I could use the parts to alter my 40 cal magazines.

 

It was almost as easy as I thought. The base extension is all FRP (fiberglass reinforced plastic). I disassembled it and found it wouldn't quite fit the 40 mag. The 40 mag was about .040 wider at the base where the extension slides on. I checked a few dimensions with a dial caliper and filed a bit on the FRP base extension and 10-15 mins later I had a 9 round 40 cal mag. 10 rounds won't quite fit. I used the base, the spring and the spring retainer from the 9mm mag and kept the 40 cal follower of course. Seems to be perfectly functional, but I'll test fire it at the range for reliability.

 

If I don't have any issues, I'll probably modify a couple more. It is a little pricey, since you have to buy 2 mags to make one. I could have simply machined bases from aluminum and made it slightly longer to take the full 10 rounds I wanted, and used some generic Wolff magazine spring material, but this was too easy and it looks factory.

 

IMG_20160301_220539_zps1fo0jyys.jpg

IMG_20160301_221031_zpssdcteqai.jpg

 

TJay74 Senior Enthusiast

TJay74

Posted
Posted

Nice, I am trying to find a (ultra) compact Sig for the wife to try out for her to carry. Needs to be 9mm and light as possible. I already have the P938 and may put her in it, only concern is the flip safety. I would rather have something along the lines of a striker fired system. I bought her a Kahr CM9 but she hates the trigger on it with a passion. She can hit center of the silhouette with it, but she is dead on accurate with the P228 I got or the P938.

Spurshot Senior Enthusiast

Spurshot

Posted
  • Author
Posted

Nice, I am trying to find a (ultra) compact Sig for the wife to try out for her to carry. Needs to be 9mm and light as possible. I already have the P938 and may put her in it, only concern is the flip safety. I would rather have something along the lines of a striker fired system. I bought her a Kahr CM9 but she hates the trigger on it with a passion. She can hit center of the silhouette with it, but she is dead on accurate with the P228 I got or the P938.

 

Take her to a store and let her handle a P239 9mm. It's a double action first shot and single action from there. It's not the smallest gun, but it isn't brutal to shoot like really small guns can be in adequate defense calibers. My wife shot 250 rounds of 40 cal out of the pictured gun, in about 4 hours.

TJay74 Senior Enthusiast

TJay74

Posted
Posted

That is one on my list, along with the S&W MP9c, a XD 9 sub-compact, and a couple other Sig models. I am leaning more towards the models that are around the 21oz range as she doesn't want anything super heavy since she will be carrying it in her purse.

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      I have an old dental chair in my shop. Something I got for free and apparently it has more than scrap value? People collect them although mine isn't restored or anything. It's visually interesting (1930's Ritter) which is why I like it. And it IS decently comfortable if you kick back.   When a good buddy of mine saw it he said, let me guess, Atlas. It's a conversation piece? As in, you ask the questions, they do the talking?   Where do you hide the jar of teeth?   I would never.   
    • Atlas
      OCI, not when but why?

      By Atlas · Posted

      Are we talking about the same thing, though? The 7 versus 3 wear metals was from Lakespeed's 3.0-specific oil brand comparison test between AcDelco oil and Mobil ESP. The filter remains a constant so whatever excess particles the AcDelco oil is producing aren't being filtered out.   I'm assuming there's a parallel comparison to be made; IF the filter can filter down those particles, engine life increases, and your graph makes the case that a better filter (lower micron rating) can increase engine life. Introducing fewer particles AND filtering those particles with higher efficiency is the best of all worlds. Good oil, good filter.   Where we may disagree is the "baseline relative engine life". I'm more apt to believe the base engine life value is 200k+ on very average oil and filters, "bulk oil of unknown brand and white-label generic fleet-grade filter, Jiffy Lube"   Going from a 10 micron filter to a 5 micron filter should boost a base 200k to 275k in a vacuum as a single factor alone.   Here's the whatabout: How does regularly changing the oil and filter ahead of recommended schedule influence baseline engine life? Most people aren't going to science the heck out of this stuff or ask about Micron ratings, HTHS, or wear comparison tests at Jiffy Lube. Most of the Jiffy lube techs would say they need to call their tech support line to even try to get an answer.   --   Because we love anecdotes here, when I was fishing for 4.3 parts at a local yard this weekend, ALL of the 4.3 vehicles had well over 200k. I love looking at odometers of junked vehicles. How far did THIS go before landing at the crusher? The ones that still had engines weren't seized. None of them were vehicles I'd consider were Amsoil queens, in fact most of them had some kind of service cling-sticker in the corner of the windshield indicating it probably had very average maintenance services. Even the fresh parts rigs- I'm not sure taking an S/T series to 400k has much value considering the running value of those vehicles was probably somewhere around $1,000. 25+ years is a good run on time alone.   The intake manifold I salvaged had clean and bright pool areas. As expected, I found the fuel lines in the manifold rubbed through, just like mine. I'm guessing the lines on that donor truck started leaking, the truck started running rough, and its owner said that's enough I'm unwilling or can't take it out of service for several days, or spend $1000+ to repair it at a shop, it's simply time for a newer more reliable vehicle (or, more than likely, this is the 2nd, 3rd time this has happened in the truck's lifetime). While I don't count on my Blazer for reliability, the thought of giving it away for parts at certain points during my adventure, and being mentally free from its needs has has crossed my mind. I'd be losing $1500 or so, but I can only make more money; not time.
    • diyer2
      Gas Prices

      By diyer2 · Posted

      still $4.00 85 oct.
    • Mike@SolerPrf
      2021+ Tahoe Suburban Yukon Escalade Throttle Body and DLX Controller

      By Mike@SolerPrf · Posted

      Always here to help. Discount Code: TIFF5OFF
    • Mike@SolerPrf
      2019+ Silverado Sierra 1500 Throttle Body and DLX Controller

      By Mike@SolerPrf · Posted

      Always here to help. Discount Code: TIFF5OFF

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...