G20 locked up

Brassjunkie · February 17 2020 03:26:07 AM MST

I have a G20 with a double diamond barrel and carver comp. have had this set up for over a year with no malfunction.
Yesterday after firing a rather light load the barrel locked up. I've had this happen before on other guns but pushing the slide against a wood column always cleared it.
This barrel is stuck. Was able to tap the barrel open enough to get the spent case out. Case looked normal
Now it's half racked and not budging. I can only think the previous shot left something behind to bind up barrel/slide
Any tips would be greatly appreciative
Thanks

Graybeard · February 17 2020 07:21:57 AM MST

I'd say double check your barrel to make sure the bullet exited. That may not be why the gun is locked up, but it could become your next major issue.

Brassjunkie · February 17 2020 01:17:36 PM MST

Yeah it wasn't a quib. I actually hit the plate

The_Shadow · February 17 2020 03:19:49 PM MST

Brassjunkie, It may be the locking block where the barrel fits into it in the frame...Some locking blocks have broken on other guns. Try looking through the slide frame opening to see if you can get it to release...
Good luck getting the slide and barrel off the frame.

Graybeard · February 17 2020 03:24:57 PM MST

Weird that a gun would lock up on a low powered round that did exit the barrel. One would expect a mechanical failure to occur from a hot round. Let us know what you figure out.

Brassjunkie · February 17 2020 06:04:01 PM MST

Well further inspection reveals the barrel broke. I still cant get it to move much but lookimg down the barrel i can see that it came apart right in the middle. Seperated completely.
Very strange see how i was shooting moderate 40cal loads(in 10mm brass) just plinking working on speed.

Brassjunkie · February 17 2020 06:13:26 PM MST

I tried to put up a picture but it was too large

sqlbullet · February 18 2020 08:19:55 AM MST

Can you get it back into battery and field strip it?

Also, if it helps, remember that with the slide partially open you can remove the striker cover plate, striker, etc. This can help a bit when taking down a tied up Glock. Saves you from having to dry fire it.

Also, if the barrel is full seperated, you may be able to pull the front of the barrel out, though I bet it is a bit bulged.

Brassjunkie · February 18 2020 03:04:49 PM MST

Its locked up good. Only way to move it is with a hammer and alum punch.
I cant see how it would buldge, the previous bullet definitely exited and the last bullet exited.
These were 180gr powder coated
401 heads with 5.8gr of No. 2.
The last fired case looks normal.
The thing that suks is glocks are illegal to buy in Massachusetts. You have to find a preban.. 1998 i think. Also quite exspensive in ma. A gen 2 G20 in good shape is around $700....

rognp · February 22 2020 03:24:07 PM MST

It may help to put a rod down the bore tohelp keep the pieces in alignment. Secondly a whole bunch of heavy duty lube apply like it wasnt yours. STP is a good lube for really stuborn stuff, it doent sound like you need a penetrating type oil just severe friction reduction

gnappi · June 15 2020 08:29:27 PM MDT

40 cal loads in a 10mm case?

I did not think it's likely in a pistol case but since it did happen look up "Secondary detonation" in a decent load book or search the web.

It's more common in light loads with fast powders with rifles. Years ago I read that the theory says that powder lying flat in a case (not held up against the primer) causes a powder flash over the powder, THEN the powder on the bottom ignites causing an horrific pressure curve.

Rifle guys always use a case filler like (IIRC) dacron when using light loads.

gnappi · June 15 2020 08:38:29 PM MDT

PS, AA2 isn't even on the accurate chart for 10mm, they really do have a reason for their published load data.

https://www.accuratepowder.com/wp-content/uploads/2011/01/accurate_load_data_3.5.pdf

gnappi · June 15 2020 08:45:05 PM MDT

Quote from: Brassjunkie on February 18 2020 03:04:49 PM MST
Its locked up good. Only way to move it is with a hammer and alum punch.
I cant see how it would buldge, the previous bullet definitely exited and the last bullet exited.
These were 180gr powder coated
401 heads with 5.8gr of No. 2.
The last fired case looks normal.
The thing that suks is glocks are illegal to buy in Massachusetts. You have to find a preban.. 1998 i think. Also quite exspensive in ma. A gen 2 G20 in good shape is around $700....

PS2 :-) Whoever gave you that "recipe" should replace the gun. Maybe you can send it in to Glock with an explanation and see if they will sell you a replacement with your old serial number?