Magical Mystery tour: common reasons for KSC GLOCKs cycling problems

[Jimski]

Hello all,

since I'm getting cycling problems with my Glock 26, and because I've been swapping a lot of parts, I'd like to know what are the most common causes for pistol-related cycling problems (as opposed to magazine-related problems)

from reading aroud, I understand that a cycling problem is often caused by:

KSC glock manual: http://www.pegatiros.com/download/de...1-ksc-g17s.jpg

the common causes for failed cycles are:

cold temperature

insufficient amount of gas output-->
not properly loaded magazine
weak/worn hammer / hammer bar bent ?

insufficient blowback-->
previous causes or
bad sliding action (high friction) / bad nozzle action (high friction in the chamber ?)
broken rocket valve
rocket valve weak spring ?
bad chamber-to-magazine seal, gas gets lost ?


failed hammer cocking-->
previous causes or
recoil spring too strong
hammer spring too strong?
Cracked hammer sear (part #87 or 83 on KSC) will cause the hammer to sit about 1mm higher when cocked, and it either prevents or slows the slide from cycling.
bent or fucked hammer bar
bad valve action on the magazine! fiddle with the valve!
bad luck.

failed chambering-->
previous causes or
recoil spring too weak (weak slide return)

Also:
chambering without hammer cocking-->
broken hammer sear/ ( the hammer will stick up anywhere from 1mm to half cocked to no cocking at all)

correct clycling when no BBs in the mag, no cycling or problems with a mag full-->
?


too much internets-->
limp wrist

thank you!

[tunabreath]

The SINGLE MOST COMMON cause of ALL GBB problems?

Too cold.

People often forget that one, haha.

[CDN_Stalker]

Cracked hammer sear (part #87 I think on KSC?) will cause the hammer to sit about 1mm higher when cocked, and it either prevents or slows the slide from cycling.

[Blackthorne]

limp wrist?

[Jimski]

ok ,
and when the action chambers another round but the hammer doesn't lock in cocked position, what's happening mechanically ?

[CDN_Stalker]

Then the sear is broken.

[Jimski]

ah, how so?
thx !

[Tex]

Just a bit more info* on part #87 it used to be part #83 so if your KSC glock is as old as mine your manual will say 83 but it is the same part.

The rocket valve (part #24 for KSC) breaking will also cause failure to cycle/blowback properly. and they do like to snap in half.

*Not sure how useful this info is as there seems to be less and less old glocks and old glock owners out there now.

[CDN_Stalker]

Originally Posted by Jimski

ah, how so?
thx !

The hammer has a little spur on it that latches with the sear. If that spur has broken off or gotten worn down to the point it won't latch, the hammer won't sit in the cocked position. Other side, if the 'hook' on the sear has broken off, then it won't latch with the spur on the hammer. So it's a case of either/or, just a matter of finding out which one.

[Jimski]

ok , but would the hammer stay cocked if you cocked it by hand (with or witouht the slide mounted) and the sear was broken?

[Tex]

yes it will but the hammer will stick up anywhere from 1mm to half cocked.

[CDN_Stalker]

If the sear was broken it'd stay in the full forward (firing) position, meaning there was nothing to hold it in the cocked position. If it was cracked but intact, it'd sit like the pic Tex posted above.

[Tex]

Part #87/83 is completely snapped in half in that pic.

[CDN_Stalker]

Must be the old type you referenced before. I've never seen one with a broken #87 that would stay down in the cocked position.

[Cilantro]

I hate to pipe in here with an issue, but I figure it's on-topic and lots of glock experts will be on this thread, but basically: my new (from classifieds :P) KSC Glock 18c won't cycle back properly. It blows back fine, but 90% of the time won't cycle back properly, getting stuck somewhere in the middle, and venting out all the gas. At first I thought it had to do with the loading nozzle, since it seems like it's a pretty tight fit, and won't spring back smoothly, but now I'm thinking the slide itself may also be involved. Any suggestions? I cleaned it out, checked the parts, it all looks fine, but there's something going on here.

Thanks again, and mods please move if this isn't the right spot.