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Modifying and Stippling my P320C (Picture Heavy)

This is a discussion on Modifying and Stippling my P320C (Picture Heavy) within the P250 & P320 Modular Pistols forums, part of the SIG Sauer Pistols category; Hey guys, I've larked the forum for a while but decided to make my own account so I can create this thread. I own several ...


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P250 & P320 Modular Pistols P250, P320, and Exchange kits

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Old 01-09-2017, 01:20 PM   #1
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Hey guys,

I've larked the forum for a while but decided to make my own account so I can create this thread. I own several guns, but Sigs seem to always be my favorite to shoot. I have a P229 Extreme and Legion, P226 Legion, and a P225. The P229 is by far the best feeling gun I've shot so when they came out with the P320 i was interested in picking one up and just happened to get around to it this past week.

Since I like the P229 so much I went with the P320 Compact since it's basically the same size.

Off to the range: Day one I shot 150 rounds, about 100 of which went through the P320C. It was a interesting experience because I was hoping for my typical shooting but was left disappointed in my shooting and mostly blamed it on the trigger. On the P229 and P226 the short reset trigger is amazing; short takeup, your finger hits a wall of resistance and then it breaks like glass. Very predictable and very accurate. With the P320C I can't say the same things about the trigger. On the P320C the trigger has some take up, about 1/8 inch CREEP, and then it randomly drops somewhere in the next 1/8 inch. The result of this is I could be spot on one second and then pull somewhere left or right 3" the next round. I'm blaming me moving the gun off the POA during the creep phase of the trigger pull. Also I'm not a fan of the 7-8 LBS trigger pull, I much prefer the 4 lbs range that my other Sigs came with.

Here's my target at 7 yards. 150 rounds.



Next I came home, cleaned the guns, and ordered a APEX flat trigger hoping that solves some of my trigger issues. I would send it to Gray or someone to work on the trigger but at the cost of 50% of the price of the gun that seems alittle steep.


Last edited by josh7owens; 01-09-2017 at 01:57 PM.
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Old 01-09-2017, 01:34 PM   #2
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On to the next step...

I ended up ordering a second frame (P320 Compact M size) The plan is to stipple the frame along with modifying it to fit my hand better. At the price of $43 it seems like a good idea considering if I mess it up I can always put the original frame back on. Below is pictures of the modified frame along with what I changed. I don't think the pictures do it justice in how much the changes actually make it feel different once in your hand.

Right Side:
- Removed sig logo
- Removed stock stippling and smoothed out the body
- Undercut the trigger guard
- Undercut the beaver tail
- reduced the hump behind the mag release so the hand lays against the frame of the gun better.




Left Side:
- Removed sig logo
- Removed stock stippling and smoothed out the body
- Undercut the trigger guard
- Undercut the beaver tail
- Removed the frame line that your thumb lays on during a fingers forward grip to better lay against the frame



I'm still debating if I'll add a magwell to this frame and I'm also still waiting for a stippling iron setup to come in the mail so I can stipple the gun. So stay tuned and I'll leave you with a couple pictures of what the gun looks like reassembled with the new frame.


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Last edited by josh7owens; 01-09-2017 at 02:00 PM.
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Old 01-09-2017, 02:51 PM   #3
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I found that the "creep" (mine would actually creak) can be mitigated with some polishing of components. I started a discussion thread about it a few threads down. Ive had good luck with mine so far.
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Old 01-09-2017, 05:11 PM   #4
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I'll check out your thread. Sanding, cutting, or polishing the sheer makes me nervous though. For one the fact that if I mess it up I doubt I can order those parts to fix it and I don't want to mess with the reliably of the gun.

I'll watch that video you posted and assess if I think it's within my skill level. Hopefully tomorrow my trigger will come in and I'll be able to install that. The stippling kit I ordered should be here by the end of the week.

-off to watch YouTube videos on how to stipple a gun. ?
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Old 01-09-2017, 06:03 PM   #5
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I just used his video this weekend along with Alma's for FCU assembly/dis-assembly for an Apex trigger and quicky polish job. I used a Dremel instead of Q-tips. Easy-Peasy and I started at 7.5lb + and ended with 6-6.5lb. I used a dremel instead of Q-tips. But like I said it was a quicky to see if I could do it and see results before getting greedy for more...lol!
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Old 01-10-2017, 05:33 AM   #6
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Nice shooting actually. If that's considered bad, you're going to get laser beam better with more practice as you "fix" your grip/trigger pull tendencies.

I like how you've adapted your grip to fit you. It's nice to be able to invest a mere $42 and not irreversibly change your pistol forever if you want to resell it later. You seem to me to be able to craft a grip with tools at your disposal to be "state of the art" and not adversely affect the inner workings of the gun while doing it.

I'm interested in seeing your stipple job when you're done.

BTW... glad you're joining in from lurking. Welcome to the community!
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Old 01-10-2017, 06:31 AM   #7
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I recently ordered both Small and Large grip modules with the intent to fully fit them to my liking and then stipple them. Sanding, smoothing, undercutting etc just as a little project. I love the feel of the fatter grip area on the large but don't like the hump in the back.
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Old 01-10-2017, 01:38 PM   #8
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Quote:
Originally Posted by HoosierDaddy View Post
Nice shooting actually. If that's considered bad, you're going to get laser beam better with more practice as you "fix" your grip/trigger pull tendencies.

I like how you've adapted your grip to fit you. It's nice to be able to invest a mere $42 and not irreversibly change your pistol forever if you want to resell it later. You seem to me to be able to craft a grip with tools at your disposal to be "state of the art" and not adversely affect the inner workings of the gun while doing it.

I'm interested in seeing your stipple job when you're done.

BTW... glad you're joining in from lurking. Welcome to the community!

Thanks for the kind words man! Here's some of my better shooting.




Hopefully the Oregon Trail Defense Stipple kit comes by Friday and I can do it over the weekend and have everything posted up by Monday.

To Magwell the gun or not?!
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Old 01-10-2017, 02:06 PM   #9
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The Apex flat trigger is installed, It only took about 5 minutes to do. Below is a picture of the tools I used.

From dry firing it in my living room at various objects around the room I must say I like the improvement. It may all be in my head but the take up seems smoother. That 1/8 inch of creep is still there and then it breaks somewhere in the next 1/16 of a inch. Still not my P229/P226 trigger but better. When dry firing this gun before the grip mods and trigger I would pull left or right during the creep phase of the pull. Dry firing in the living room my sights aren't moving when pulling the trigger during that phase anymore. I'm interested in testing it out. Maybe I'll do that tomorrow while we wait for the stippling it to come in. That may give me a better ideal of how I'll like it and if it needs any changes to the frame before the final stippling is done.




Video of the trigger pull and reset!!!-
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Old 01-10-2017, 05:01 PM   #10
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Speaking of stippling, I got partway through my practice piece for my eventual competition frame. I like the feel of the texture so far. Gotta figure out exactly where I want the top of the backstrap to be.
Attached Images
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Old 01-10-2017, 07:49 PM   #11
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Looks like you smoothed out some of the same area I did. I'm going to run my stippling up the underside of beaver tail to where it meets the top. I wish the frame looked a uniformed black color instead of the sanded part looking gray/black. If it doesn't turn out looking right I'm going to look into coating or painting it black.
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Old 01-11-2017, 01:41 AM   #12
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Originally Posted by josh7owens View Post
Looks like you smoothed out some of the same area I did. I'm going to run my stippling up the underside of beaver tail to where it meets the top. I wish the frame looked a uniformed black color instead of the sanded part looking gray/black. If it doesn't turn out looking right I'm going to look into coating or painting it black.
I thought running the stippling up the beavertail was a good idea at first also until I tried it. The webbing on your thumb/index finger gets pretty beat up by it IMO.

I'm planning on sanding my final piece to a much more appropriate finish. Might even tape off areas that I don't want to get sanded first.
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Old 01-11-2017, 05:38 AM   #13
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Great thread here. Plenty of useful info, thanks for posting guys!
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Old 01-12-2017, 11:26 AM   #14
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Today I polished all of the trigger parts in hopes it improve the trigger. I'm about to go to the range and test it so I'll make this post quick.

Detailed pictures of trigger assembly before taking it apart:






Taken apart and organized:


Polished:






Reassembly:





Total time invested was about 2 hours. I used Mag polish, dremel, qtips, gun grease, lucas gun oil.

Off to the range for testing of the trigger and the stock grip compared to the modified one. Stipple kit will be here Saturday.
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Old 01-12-2017, 02:30 PM   #15
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Hey Guys,

I went the the range today and tested the new trigger. I think it's improved over the stock one but without a gauge to test the pull weight I'm not sure how much it changed.

This test below was to test the difference between my stock grip and the grip I've modified to better fit my hand. The modified grip isn't stippled yet but I wanted to shoot it to make sure I was happy with the feel before finishing the stippling.

Disclaimer: Everything was shot at 7 yards. I tried to be as scientific as possible and eliminate as many variables as I could. The first way was I alternated the grips and shot 5 sets each grip then switched grips. So I started with the stock grip, shot 5 sets of 5 shots, then switched to the modified grip and repeated. After that set was done I sent back to the stock grip for the next and then back to the modified grip for the last set. I shot 105 rounds total, the last 5 being random at the bulls eye. I also set the target sheet up to where the right upper corner was stock grip and bottom left corner was stock grip. This was I shot each grip at both sides of the target and shot both at the top and the bottom of the target.

I also removed the extremes from each set of 5 sets. So I removed the closest and the furthest away in each of the 4 quadrants. This will give me more accurate data. 8 shots total removed.

Pictures below, then data:

First 5 shots:


The Target:


The Data:


So for the data.

Overall average with the stock grip from center: 1.19 Inches
Overall average with the modified grip from center: 1.03 Inches

Best set stock grip: .475 Inches
Best set modified grip: .7 Inches
Best Overall: Stock Grip

Worst set stock grip: 1.875
Worst set modified grip: 1.325
Worst Overall: Stock grip

Summery of data: Overall I can quantitatively say that my modified grip has improved my shooting by 13.45% or roughly .16 inches from center. My best set and my worst set happened to be with the stock grip which means I'm more consistent with the modified grip than the stock one.


Other interesting fact; I redid all of the data while taking out not only the extremes from each quadrant but also ran the data taking out the extremes of each target. (the high and low) Meaning I ended up running data on 8 targets of the 10 from each grip. The data basically came out the same besides my best set was now with the modified grip and yet my worst set was still with the stock grip. I'll post this data with these extreme removed below.

Overall average with the stock grip from center: 1.20 Inches
Overall average with the modified grip from center: 1.04 Inches

Best set stock grip: .83 Inches
Best set modified grip: .825 Inches
Best Overall: Modified Grip

Worst set stock grip: 1.6875
Worst set modified grip: 1.2187
Worst Overall: Stock grip


I think it's safe to say the modified grip has improved my shooting ability with the P320C. Considering the stippling isn't even done yet I forsee those numbers improving alittle more by the time I'm complete with the grip. Maybe I should run this test again once it's done?

I still think I'm better with the P229 Legion or Extreme than the P320C though.
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