Sig Sauer P365 air pistol: Component two | Air gun weblog


by Tom Gaylord
Writing as B.B. Pelletier

Sig P365
Sig Sauer P365 BB pistol.

Component 1

This report covers:

  • The test
  • Realism
  • Fresh CO2
  • Oiled the pistol
  • Hornady Black Diamond
  • Sig BBs
  • ASG Blaster BBs
  • Daisy Match Grade Avanti Precision Ground Shot
  • Nature of CO2
  • Shot count and blowback
  • Trigger pull
  • Installing the CO2
  • Summary

These days we appear at the velocity of the Sig P365 Air Pistol. If you are new to airgunning you want to know that CO2 responds ideal to two issues — higher temperature and a lengthy barrel. The temperature was fine when I tested the gun (74 degrees F) but we are dealing with a compact pistol whose barrel has to be brief. That will influence the energy of any CO2 pistol, regardless of the maker.

The test

I shot by way of the chronograph at two feet distance from the start out screen. I waited a minimum of 10 seconds amongst shots in today’s test. Often the wait was substantially longer but it was by no means significantly less. Later in the report I will address why this is required.


I have told you how realistic this pistol is. I nonetheless have to verify the gun every single time I deal with it for the reason that my 9 mm P365 that is constantly loaded is in my workplace all the time. It would not do to choose up the incorrect pistol!


Fresh CO2

For this test I loaded a new CO2 cartridge. I constantly place a drop of Crosman Pellgunoil on the tip of every new cartridge just before piercing it. When the cartridge is pierced the oil is blown into the valve and it gets on all the o-rings and seals inside. It keeps them fresh and performing their job. At the finish of the report I have an vital message about piercing this pistol, so do not miss it.

Oiled the pistol

I talked to Ed Schultz of Sig concerning the P365 and he told me this BB pistol tends to run dry. Oiling some crucial points will aid make sure smooth reputable operation. Just pull the slide as far back as you can and hold the pistol upside-down to access the oiling spots below the slide, as shown in the photo beneath that Ed sent me.

P365 oil
From Ed Schultz to you. These are the four areas to oil the P365 slide periodically. Also oil every new CO2 cartridge.

Ed says Sig is searching into an oil they can sell for this objective, but for now you can use a 20-weight non-detergent motor oil that has an o-ring conditioner in it. Crosman Pellgunoil is a great option!

Hornady Black Diamond

1st up was the Hornady Black Diamond BB. The P365 magazine holds 12 BBs, but I loaded just ten for this test. That way I can test the magazine hold-open function as nicely.

Ten Black Diamonds averaged 298 f.p.s. Due to the fact these had been fired initial there was a broader spread of velocities. The low was 287 and the higher was 319 f.p.s. — shots a single and two, respectively. That is a spread of 62 f.p.s. The typical was quite close to exactly where it must be, even although the extremes are far apart. It is listed at a maximum of 295 f.p.s. and that is what this a single gets. And, the magazine hold-open operates precisely as it must. I will inform you in a bit why the spread was so massive.

Sig BBs

Sig does not make BBs — however. So they do not have their personal brand of BBs to sell, but they do incorporate a modest plastic packet of steel BBs with every gun. So I attempted them. They averaged 299 f.p.s. with a spread that went from 293 to 305 f.p.s. That is a distinction of 12 f.p.s. Now that the CO2 gas in the cartridge is getting utilised the gun is settling down. Usually the initial couple shots right after piercing a cartridge have liquid CO2 in the valve that bollixes up the velocity, as you saw in the initial string.

ASG Blaster BBs

Subsequent I attempted 10 ASG Blaster BBs. They averaged 299 f.p.s. with a low of 293 and a higher of 304 f.p.s. The spread was 11 f.p.s. That is close to the Sig BB overall performance. I’m not saying Sig rebrands these distinct BBs — just that all steel BBs execute about the similar in this pistol, as soon as it settles down. So the Hornady BBs would also be like these is I hadn’t fired them initial.

Daisy Match Grade Avanti Precision Ground Shot

The final BB I tested was the Daisy Match Grade Avanti Precision Ground Shot. For this a single I am going to show you the whole string — shot-by-shot.

2…………did not register

It is quite apparent what occurred in this string. These BBs began out just as rapidly as the initial 3, then about shot quantity 3 the liquid CO2 ran out and only gas was left in the cartridge. That is when the velocity begins to drop. Let’s see why.

Nature of CO2

CO2 develops stress when the liquid inside the cartridge flashes (evaporates swiftly) to gas. At 70 degrees F its stress is about 850 psi when it is contained in a vessel with no escape. But, as it evaporates even though the gun is shot, it cools the surfaces of the gun that it comes in make contact with with, which is all of the gas chambers and ports inside the gun. In turn this lowers the temperature and also the stress of the CO2 gas, resulting in reduced velocity. That is why I wait at least 10 seconds amongst shots — to let the gun to normalize and not cool down also substantially.

Shot count and blowback

I had heard someplace that the P365 gets about 40 great shots per CO2 cartridge and this test bears that out. The slide is modest so it is also light, so the blowback is not as powerful as with some bigger pistols. Nevertheless the slide does move all the way back and you do really feel it.

Trigger pull

The trigger has a light pull with some travel. It feels like a double action pull for the reason that of the travel. To commence shooting you have to cock the hammer by pulling back the slide unless the slide is currently locked back and you just release it right after loading a fresh magazine. The trigger pull is a surprisingly light three lbs. 13 oz. Various instances the pistol shocked me by firing just before I was prepared. I’m glad that occurred when the BB trap was only 3 feet away and not when I was shooting at a target! I’m creating a note to myself to respect this light trigger.

Installing the CO2

I purposely waited till now to talk about this process so it does not get overlooked. The P365 pierces the CO2 cartridge when the magazine cap is screwed down, like numerous gas pistols. But, there is a thick face seal (exactly where the flat finish of the cartridge bears against as it is pierced) in this magazine and the CO2 will leak out till the cap completely compresses it — so there is a unique knack to piercing the CO2 cartridge in this pistol. The initial couple cartridges I installed lost a lot of gas just before I got them sealed.

The trick is to screw the magazine cap down till it is tight against the cartridge. Then hold the magazine physique in a single hand and the Allen wrench in the other hand with the hands rotated so that relaxing them would give the finish cap nearly a complete twist. When you do this, just let every hand go its way and finish screwing the finish cap down. The CO2 will hiss for an immediate if you do it ideal and you will not shed substantially gas, if any.

P365 gas
To pierce the CO2 cartridge rapidly, hold the magazine in a single hand and the Allen wrench in the other in such a way that the hands move in opposite directions to screw the cap down swiftly.

As soon as I did this, the cartridge was pierced just as rapidly as any air pistol could. When I did the velocity and shot count test the cartridge was pierced this way, so no gas was lost.


It is been entertaining receiving acquainted with this tiny BB pistol. Mainly because I am so familiar with the firearm currently, I felt I was shooting with an old pal.

Accuracy comes subsequent, but that is not the final report. I then want to speak about working with this airgun and other folks as a self-defense education tool. I will show you my carry holsters and talk about how I use the gun to train. Till then!


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