I have an older sw40ve, and i'm looking into customizing it a bit, backplate, sights, apex trigger kit and trigger, ectect
but i see all of these parts listed specifically for the SD version and not necessarily the older SW version of the gun, so my question is do any of you know whether or not all of the accesories are interchangeable? or which ones are/are not?
thanks for helping.

I tried a SD slide back plate for my SW9VE. Although it fit, there was a gap at the bottom. I sent it back.

Two words: FORGET IT.
If you want the longer version, I have used the SIGMAS for 2 decades as stock trainers and loaners: tough and reliable.
If you must have and modify a Sigma, buy the current SD40VE: a few goodies available (they don't fit the SW). If you want a platform to continually customize and modify, get an M&P: lots of goodies, many of them useful.

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Science plus Art

It's funny because I have a friend who admitted I was right all along do that exact same thing to his SD40VE. Apex trigger, extra mags, replaced the sights. In the end he invested just enough to buy a M&P pro. lol

The SD9VE is a great affordable defensive handgun, but in all honesty if someone wants to modify it to a fun shooting range gun. Get the M&P. Because in the end, you're gonna spend that much.

Ya you might spend that much but, NOT ALL AT ONCE. That's what hurts sometimes, it's like building an AR buy the parts over a few months.

Also if you modify any of those guns BYE BYE WARRANTY if something bad happens ?

3 out

The Apex Tactical Action Enhancement Trigger will work with the Sigma Series.

The Apex Tactical Sigma Spring Kit is available for the Sigma's.

The Apex Tactical Base Pad extensions will work for the magazines as well.

XS Sight Systems make front and rear sight upgrades for the Sigma's.

The ProMag Hi Cap magazines made for the SDVE will work with the Sigma's. Also, any SDVE magazine (within the same caliber) will work with Sigma's.

The only one of the requests you have made that I CANNOT find is the backplate. But you can customize that yourself with your current one. Take it to a smith and have them etch or put a logo on it if you wish.

I hope this helps with what you were asking. Instead of telling you buy a new pistol.

The best thing is that you can do these upgrades in phases instead of spending a lump sum.

Spot on.

When I purchased my SD40VE, I was upgrading from a Hi-Point pistol that was having massive issues with FTF (Failure To Fire).

The SDVE's just came out, so I went that route because money was tight.

Then I wanted to customize it when money was around.

Cerakoted the slide black (twice): $75.00 per time.

Apex Trigger w/ Install: $75.00

M&P front and rear sights: Free, someone gave them to me.

Sure I could have bought an M&P after spending this amount of money, but some of us (at the time) don't have that much at once.

Plus, its fun to mod things.

- Preston

According to S&W, back-plates are one and the same. Bought mine from,
Laser's Edge Studio Home Page , and it fits just fine.

The SD back plate worked? I thought in another thread someone said it left a gap. Do you have a pic of what it looks like installed?

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SW99 9mm Sigma VE 40
M&P 15