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| Member |
I have two 9mm p365s. If I buy a p365-380 barrel and recoil spring, am I able to convert my 9 to a 380? The two variants use the same FCU and grip module. Is the slide the same in both? | ||
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| Member |
The 380 model has several things different. First, the recoil spring is lighter: second the magazine has an added piece in the magazine to take up the space to accommodate the smaller 380 round. Additionally the 380 slide has lightening cuts into it to accommodate the lower power of the 380. Also the slide has a plate on top for an optic if you want to add one. I would venture a guess that Sig will come out with an exchange kit containing a complete slide with barrel,spring, and magazines in the months to come | |||
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| Member |
Yet, it seems as though, but for the lightning cuts, that it should work with a 380 barrel and 380 recoil spring.... | |||
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| Member |
You will probably incur jams because because the slide may be too heavy to cycle with relatively underpowered 380 rounds. How are going to get around the difference in magazines? Also I have not seen any source for the 380 barrel. | |||
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| Member |
-stroonz, Sig has barrels and recoil springs in 380 for the 365. The mags to use are either the 380 mags and the 9 mags that supposedly do work. | |||
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Oriental Redneck |
"supposedly". According to Strader in SIG's intro video, the mags are slightly different. But, the only way to know for sure is to try it out yourself. Q | |||
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| Member |
The mags look the same except for a spacer in the rear of the internal of the mag because of the length of the 380. Ruger did the same to modify the LC9 mag to work in the LC380. | |||
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| Oriental Redneck |
Yeah, so they are not the same. Q | |||
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| Member |
You are correct, just trying to explain the difference with what I see. | |||
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Member |
Why? Don't. drink & drive, don't even putt. | |||
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| Member |
“Why?“. I will tell you why I’m switching to 380 I’m now 77 but still can do many things I used to. But, recently since my last range trip my arthritis really acts up, and I can barely rack the slide….not so with the 380. So as I age, I make adjustments. | |||
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| Left-Handed, NOT Left-Winged! |
Mag shells and floorplates are the same. Followers and lockplate/spacer are different, springs probably are too. Slide is different, not just lightened but different profile on the top of the slide, oddball 8 front 6 rear irons, and shallower optic cut (due to lower profile) that doesn't allow cowitness with normal irons. Barrel is thinner wall so you can't drop in a .380 barrel into a 9mm slide. A full top end will be like $400-450 so just get the whole gun for the relatively small difference. | |||
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| Member |
I would agree, you could sell your P365 9mm and buy the P365-380. Probably come out with little out of pocket. | |||
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| Member |
^^^^^^^Thats exactly what I did. | |||
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| Member |
One problem I foresee is the cost of .380 is about half again what the 9mm is. I can buy a box of 9mm for about $20, I recently gave $38 for a box of .380. It is also harder to find lately. I understand the Arthritis thing though, Good luck with what ever you do. Ed Hurst Engines Jeffersonville, Indiana 1929 Buick 1957 Chevrolet 2011 Harley Davidson Super Glide Custom MSF RiderCoach Aircraft Machinist USAF (Ret) Viet Nam Vet (U.S. Army) Disabled Veteran Streetrod Builder/enthusiest Mortec.com Moderator | |||
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Member |
I've done the switch. You can take the P365 .380 slide and swap out the existing 9mm slide. The 9mm mags will work with .380 ammo but not super reliably. I had a few stove pipes initially but besides that I was able to shoot about 100 rounds after that without a hitch. I would recommend getting .380 mags, but in a pinch the 9mm mags work well enough for the range. | |||
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| Oriental Redneck |
Question OP had is if you can use the .380 barrel & RSA in the 9mm slide. Since you have both, do you know if that works? Q | |||
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| Member |
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| Freethinker |
Over the years I have noticed certain design and dimensional differences among SIG slides and barrels that could have been deliberate measures to prevent swapping among models and cartridges. But too, the wider chamber section of the 380 barrel could be because the 380’s slide is thinner in that area to reduce weight without changing the external dimension. ► 6.4/93.6 “Most men … can seldom accept the simplest and most obvious truth if it … would oblige them to admit the falsity of conclusions … which they have woven, thread by thread, into the fabrics of their lives.” — Leo Tolstoy | |||
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| That rug really tied the room together.  |
Yup looks like Sig didnt want people dropping .380 barrels into 9MM slides... ______________________________________________________ Often times a very small man can cast a very large shadow | |||
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