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Author Topic: P365 not locking slide back on last round (gen 1) **solved**  (Read 899 times)

Offline KFhunter

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P365 not locking slide back on last round (gen 1) **solved**
« on: March 06, 2021, 10:15:36 AM »
2  dfferent mags, same issue

Hornady critical defense and speer gold dot, same issue.

2 different shooters, both experts and 1 a trainer.


Ideas? It didn't lock 100% of the time.

Total round count less than 100



« Last Edit: March 09, 2021, 12:08:07 PM by KFhunter »

Offline wadu1

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Re: P365 not locking slide back on last round (gen 1)
« Reply #1 on: March 06, 2021, 10:33:11 AM »
I know some of the early one's had issues prior to 2018 or 19. It sounds like the magazines are not all the way in, they can lock in place and still be a tad short. I've got one 15 round mag for my 320 that wont stay open the others work fine. :twocents:
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Offline TooTallMike

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Re: P365 not locking slide back on last round (gen 1)
« Reply #2 on: March 06, 2021, 10:35:30 AM »
Check the spring tension on the slide release. If it's wonky then it might not be letting the mag follower push it completely up on the last round and letting the slide slip through.

Just a thought.


Offline fishngamereaper

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Re: P365 not locking slide back on last round (gen 1)
« Reply #3 on: March 06, 2021, 11:30:52 AM »
 Will it lock with an empty mag inserted if you pull the slide back. ?

That's test one for dirty/ broken parts. Or poor mag seating.

If it locks that way it's possible grip position is a causing factor during live fire. High, thumbs forward style grip will migrate to the slide release as a happy place for your thumbs.


Offline KFhunter

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Re: P365 not locking slide back on last round (gen 1)
« Reply #4 on: March 06, 2021, 11:58:57 AM »
Will it lock with an empty mag inserted if you pull the slide back. ?

That's test one for dirty/ broken parts. Or poor mag seating.

If it locks that way it's possible grip position is a causing factor during live fire. High, thumbs forward style grip will migrate to the slide release as a happy place for your thumbs.

The grip was watched by firearm instructor while firing and thumbs weren't hitting slide lock, he was watching for that specifically.


The slide works as normal, with empty mag it'll lock back,  but I can't recall if I was pushing up the slidelock button at the time with a thumb.  Habits.

Offline fishngamereaper

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Re: P365 not locking slide back on last round (gen 1)
« Reply #5 on: March 06, 2021, 12:02:06 PM »
Will it lock with an empty mag inserted if you pull the slide back. ?

That's test one for dirty/ broken parts. Or poor mag seating.

If it locks that way it's possible grip position is a causing factor during live fire. High, thumbs forward style grip will migrate to the slide release as a happy place for your thumbs.

The grip was watched by firearm instructor while firing and thumbs weren't hitting slide lock, he was watching for that specifically.


The slide works as normal, with empty mag it'll lock back,  but I can't recall if I was pushing up the slidelock button at the time with a thumb.  Habits.

Does it lock on an empty mag without shooting it.

Offline KFhunter

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Re: P365 not locking slide back on last round (gen 1)
« Reply #6 on: March 06, 2021, 12:02:48 PM »
Check the spring tension on the slide release. If it's wonky then it might not be letting the mag follower push it completely up on the last round and letting the slide slip through.

Just a thought.
I'll  check that

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Offline KFhunter

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Re: P365 not locking slide back on last round (gen 1)
« Reply #7 on: March 06, 2021, 12:03:13 PM »
Will it lock with an empty mag inserted if you pull the slide back. ?

That's test one for dirty/ broken parts. Or poor mag seating.

If it locks that way it's possible grip position is a causing factor during live fire. High, thumbs forward style grip will migrate to the slide release as a happy place for your thumbs.

The grip was watched by firearm instructor while firing and thumbs weren't hitting slide lock, he was watching for that specifically.


The slide works as normal, with empty mag it'll lock back,  but I can't recall if I was pushing up the slidelock button at the time with a thumb.  Habits.

Does it lock on an empty mag without shooting it.
Yes

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Offline KFhunter

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Re: P365 not locking slide back on last round (gen 1)
« Reply #8 on: March 09, 2021, 10:44:57 AM »
Empty mag function test, it locks back every time.

Dunno, wondering if my mag springs got weak.

I got a buddy that'll have the answer.

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Offline fishngamereaper

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Re: P365 not locking slide back on last round (gen 1)
« Reply #9 on: March 09, 2021, 11:01:43 AM »
Empty mag function test, it locks back every time.

Dunno, wondering if my mag springs got weak.

I got a buddy that'll have the answer.

Sent from my SM-G965U using Tapatalk

Forgot about this.

Ya pretty common for the mag springs to be one of the issues. Try a one round test. Load a round into the chamber and make sure the mag is empty. Shoot and see what happens.

Offline KFhunter

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Re: P365 not locking slide back on last round (gen 1)
« Reply #10 on: March 09, 2021, 11:09:52 AM »
Empty mag function test, it locks back every time.

Dunno, wondering if my mag springs got weak.

I got a buddy that'll have the answer.

Sent from my SM-G965U using Tapatalk

Forgot about this.

Ya pretty common for the mag springs to be one of the issues. Try a one round test. Load a round into the chamber and make sure the mag is empty. Shoot and see what happens.
Just did that, it locked back as it should.

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Offline fishngamereaper

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Re: P365 not locking slide back on last round (gen 1)
« Reply #11 on: March 09, 2021, 11:15:34 AM »
Empty mag function test, it locks back every time.

Dunno, wondering if my mag springs got weak.

I got a buddy that'll have the answer.

Sent from my SM-G965U using Tapatalk

Forgot about this.

Ya pretty common for the mag springs to be one of the issues. Try a one round test. Load a round into the chamber and make sure the mag is empty. Shoot and see what happens.
Just did that, it locked back as it should.

Sent from my SM-G965U using Tapatalk

 :tup:

I would add a round at a time and see at what point the spring develops its weak memory at.

Offline KFhunter

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Re: P365 not locking slide back on last round (gen 1)
« Reply #12 on: March 09, 2021, 11:37:06 AM »
I'm upgrading my mags with +2 springs, follower and floorplate

Make them 12rd mags with same concealment factor as the factory 10 rd with finger tab.  Slightly longer than the factory flush bottom plate, but I prefer having a home for my pinky finger anyways. 



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Offline KFhunter

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Re: P365 not locking slide back on last round (gen 1)
« Reply #13 on: March 09, 2021, 12:05:16 PM »
Mag springs weak, def the problem.

Took apart the mags and the springs were not much longer then the mags themselves, 1 coil protruding instead of 3

Pulled on them a bit to lengthen them out, now they got more push.

Just did a full mag dump and it locked back, so problem found.

New mag springs are the solution, they're on order.


Stretching them a bit is temporary.

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« Last Edit: March 09, 2021, 03:02:37 PM by KFhunter »

Offline MountainWalk

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Re: P365 not locking slide back on last round (gen 1) **solved**
« Reply #14 on: March 09, 2021, 12:20:54 PM »
Kinda along the same lines, but is there any truth to magazine springs losing strength  by staying loaded for long periods?

   I've only owned a few auto pistols. I have a Glock 10mm, and 6 mags. 3 stay loaded. Every other week I swap mags.
 Is this unnecessary? Thank you sirs.
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