solved premature slide lock for good

[olympicmotorcars]

No, my MK-9 did PSL at least once in every mag, no matter what ammo I used and no matter that I ground down the stud a lot.

I gave up and traded it in.

When I first got the CM40, it did the same thing 3 times in 200 rounds.

Then I used Gunscubber inside the mags and got them really dry, never a failure since then.

The 9mm mags were oiled from the factory, and I do recall cleaning and oiling them.

You can easily see this yourself. Mount the barrel to the slide with the SL and put in a mag. In fact, don't bother with the barrel. You can see that if the round comes forward just a bit the fatter part of the bullet smacks the SL. SO preventing the round from coming forward is one cure.

I can understand that the dry magazine will probably help with enough friction to keep the round from going forward , but I am uncomfortable with any configuration that will allow a round ( under any circumstances ) to contact the slide lock.

It would be my luck that when I really needed my weapon , a drop of errant lube would have found its way into just the right spot and the round would slide forward and lock it up.

I may eventually get some Hornady critical duty and try them with my other slide lock, but for right now I am satisfied with this solution.

[gb6491]

Just my two cents:
My CW45 would intermittently lock the slide back with rounds still in the magazine.
What remedied this for me was tightening the slide stop spring screw:
http://www.kahrtalk.com/showpost.php...72&postcount=5
Regards,
Greg

[JimC]

Clean and dry inside of any semi-auto pistol mag has worked just fine for me for over 45 years. I'll skip all the other suggestions, including "waxing"...

[harzer]

I cleaned the mags of the cw380 with degreaser in and out, filed and polished the slide stop and it is still doing it with both mags on round nose bullets only. Kind of aggravating.I have the cw45,cw40 and pm9 none of them has a problem.

[olympicmotorcars]

That is a very interesting thought GB6491. I may play with the slide stop spring some if I get brave. I have always been afraid to touch it in the past after reading the posts about stripping out the threads in the polymer.

[Schriscoe]

solved premature slide lock for good

Good info here guys. I just bought a CM9 and was getting discouraged by premature slide locking. It had only happened with +p 124 gold dots and 147 JHP loads. Not with 115 of any kind. I've got some things to try now. It's fun to shoot otherwise, just not quite as fun as my XDs 45. But the Kahr is lighter.

[garyb]

You do NOT want the inside of the mags slick. This is a big mistake and will lead to PSL on some guns.
MINE was cured by degreasing the inside of the mags. If the next round is allowed to slide forward under recoil it can strike the SL causing PSL.

"On some guns"? Really? Which ones? There are wax based products out there specifically for guns. Nothing new.....been around for many years. For example...."Blue Wonder Armadillo" - states right on the packaging...."Dry Lube for Slides and Magazines"....Hmmmm. Gun wax is not a new method for gun lube and protectant. It has been around for a LONG time. Waxing as I described worked just fine on my PM's 5 mags. You'd think if there was a problem it would have showed up over the last few years. Curious as to what source your info came from as to waxing the mag will cause PSL and specifically on which guns? Interesting.

[scosgt]

"On some guns"? Really? Which ones? There are wax based products out there specifically for guns. Nothing new.....been around for many years. For example...."Blue Wonder Armadillo" - states right on the packaging...."Dry Lube for Slides and Magazines"....Hmmmm. Gun wax is not a new method for gun lube and protectant. It has been around for a LONG time. Waxing as I described worked just fine on my PM's 5 mags. You'd think if there was a problem it would have showed up over the last few years. Curious as to what source your info came from as to waxing the mag will cause PSL and specifically on which guns? Interesting.

I think I made it clear that the PSL problem on my two Kahrs was traced to oil inside the mags allowing the rounds to slide forward under recoil and therefore be able to hit the SL on the way up.

Now go wax whatever you want.

[garyb]

I had hoped you might provide some references against using wax. I had a sincere interest in your comment and thought maybe you were on to something. Therefore, I did a little more research on the mag cleaning and lube issue. Several references referred to using gun wax products including: Flitz Rifle/Gun Wax; R. Gail Lock Co. Carnuba Gun Wax # 36; some use certain auto wax products; and Johnson's Floor Paste wax. Specifically described was to do the spring, inside and outside of the mag. Benefits include preventing rust and wear. Most significant is that buffed out wax does not attract dust or dirt. Still others (ie., www.Xavierthoughts.blogspot.com recommends powdered graphite for mag followers and spring. Some recommend dry lube/rust inhibitor like Eezox. Finally, some do use very light coat of oil, but wipe it out because it does attract dust and dirt, particularly if dropping mags to the dirt during competition....makes sense.

YES, it was clear that you had problems with oil inside your mags and perhaps they were not cleaned well....but that is oil, NOT buffed out wax...and wax on the mag...NOT the follower. Wax stays put and won't migrate to the follower/bullet surface. Could be that oil from your mag got on your follower surface and allowed the rounds to slide? I don't know, but the info you provided did not relate to wax on the inside surface of the mag. The info related to lube on the follower.



Other than yours, it seems to me that there are NO references that clearly speak against using wax on mags. In fact, it appears that wax may be one of the best products for both the outside and inside of mags and springs (not followers). It protects the surfaces, provides dry lubrication and does not attract dust and dirt. There are gun wax products available on the market but several references successfully use Johnson's Floor paste wax just as I do.

As an aside, another thing I learned is that some recommend against using very light oil for two reasons: 1. It attracts dust and dirt, particularly if mags are dropped in the dirt....This makes perfect sense...hence use wax or graphite. 2. Oil will kill primers. However, www.thetruth.com did an extensive test on primed ammo and found that the assumption that oil will kill loaded ammo primers is totally FALSE. The test soaked the primer in oil and the ammo fired just fine. The article specifically stated that light oil wiped down on the inside of mags is not nearly enough to affect the primer of loaded ammo.

That's my research....but we are getting off the OP's thread a bit so I'll let it go at that.

[scosgt]

PSL is a known and documented issue on the small Kahr guns.
I told you what I found that cured it - simply degrease the inside of the mags.

You have waxed on about wax. Wax whatever you want.

Anyone with PSL issues on a Kahr should completely remove all oil from the inside of the mags. The added friction on the rounds helps prevent them from sliding forward under recoil.

[garyb]

Do NOT wax the inside of the mags. You do NOT want them slippery, it allows the rounds to slide forward under recoil and contact the SL on the way up.
Degrease degrease degrease.

Calm down. Just a dialog providing additional references about your comment.

[yqtszhj]

Just my two cents:
My CW45 would intermittently lock the slide back with rounds still in the magazine.
What remedied this for me was tightening the slide stop spring screw:
http://www.kahrtalk.com/showpost.php...72&postcount=5
Regards,
Greg

That's what I was thinking too. Especially if you still get the slide lock problem now after your mod.

[muggsy]

Calm down. Just a dialog providing additional references about your comment.

Gary, I think that you waxed eloquently on this issue. Just because degreasing cured the problem on one gun doesn't necessarily that it will cure the problem on all guns. Not only do I wax my mags, but I deburred the feed lips as well and have never experienced premature slide lock.

[Schriscoe]

solved premature slide lock for good

I have decided my gun is just a bit ammo finicky. Speer gold dot 124 +p and WWB 147 JHP both seem to elicit premature slide lock mid magazine. I'm now about 300 rounds into my CM9 and this seems to be consistent. I just function tested shooting 1 handed to rule out thumbing the slide lever, and got my 1 slide lock malfunction with the 147s. Then got one FTF with 124 +p golden sabers. So far, Hornady Zmax and hornady critical duty 135 seem to run fine. I'll be carrying critical duty, got a great deal on some 50 round boxes so I'm thrilled the little Kahr likes it.