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Automag III Barrel Delay Assembly

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OneWay View Drop Down
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    Posted: 12 Feb 2024 at 9:50pm
The Automag III uses what is called "Barrel Delay Plunger and Spring".
I know for a fact it will run without them installed, BUT they are obviously there for a purpose or it would not have had extra parts and machining (running the production costs up) in production.
For the life of me I cannot visualize the function of the Barrel Delay Assembly.  Does it delay the opening briefly to allow the barrel to clear the locking lug?  Or, does it retard lock-up to allow for the slide to go smoothly into battery?  Figuring this out, why this 'tiny spring loaded plunger' can have any effect running nose to nose with a large guide rod spring is a baffling to me.  Or, is it meant to serve the same purpose as a recoil spring buffer on a 1911?

If anyone has a full function knowledge I'd sure be much obliged... My head hurts! Confused
THANKS
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Post Options Post Options   Thanks (0) Thanks(0)   Quote OneWay Quote  Post ReplyReply Direct Link To This Post Posted: 13 Feb 2024 at 2:35am
HELP PLEASE
I just received the Barrel Delay Plunger and Spring.  With the Spring in the proper hole on the end of the recoil spring guide the Plunger when fully compressing it still extends out .123 past the face (where it contacts the front of the barrel lug).
[AUTOMAG III .30 Carbine]   If some good person could measure the uncompressed spring, and then the plunger it would be a big help.  Either the spring or the plunger has to be too long.  These were supposed to be factory replacement parts from InterArms Inc. but maybe they are supposed to be fitted (cut).  Full compression still leaving a .125 Plunger parked with .123 hold-off between the face of the recoil spring guide face and the barrel lug can't be correct...
Thanks in advance
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Luc V. View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Luc V. Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2024 at 6:51pm
Here some pictures with measurements that may help:



The spring is NOT compressed.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote OneWay Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2024 at 6:59pm
THANKS KINDLY
Guess I will start whittling Wink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Yellow Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2024 at 10:36pm
Ok Luc, that’s quite a difference with mine. My plunger is 18,85mm. 
My spring is 11,50mm uncompressed, so that’s about the same. 
My plunger is flush with the guiderod if I push it in. Does yours stick out then?

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Post Options Post Options   Thanks (0) Thanks(0)   Quote OneWay Quote  Post ReplyReply Direct Link To This Post Posted: 15 Feb 2024 at 12:56am
Originally posted by Yellow Yellow wrote:

Ok Luc, that’s quite a difference with mine. My plunger is 18,85mm. 
My spring is 11,50mm uncompressed, so that’s about the same. 
My plunger is flush with the guiderod if I push it in. Does yours stick out then?



From what I could gather .500 spring length was common so I whacked it off there.  Then the .750 plunger would not seat to the surface so I shortened it to .670.  Now the spring-loaded stem seats just below the surface where it belongs.

As I said earlier my AM III cycled fine while I had it and never had the spring/plunger as far as I know.  But there was a polished spot on the face of the barrel lug that suggests otherwise.  What I did notice was when disassembling and removing the slide from the frame always took some tinkering to get it to slide free.  Now with the spring/plunger installed it freely slides off the frame.  Sounds like the barrel wasn't QUITE disengaged from the frame, EH?

Thanks to all who helped me with information I needed.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Luc V. Quote  Post ReplyReply Direct Link To This Post Posted: 15 Feb 2024 at 11:53am
Originally posted by Yellow Yellow wrote:

Ok Luc, that’s quite a difference with mine. My plunger is 18,85mm. 
My spring is 11,50mm uncompressed, so that’s about the same. 
My plunger is flush with the guiderod if I push it in. Does yours stick out then?


Sorry, but I can't follow your logic here?
Your plunger and spring total length is 30.35 mm so it is longer as mine:
15.8 + 12.0 = 27.80 mm. Guess you made an error in translating the numbers LOL

When compressed, the spring and plunger sit a hair deeper inside the recoilrod. 

To oneway, the difficulty in removing the slide off the frame is most likely you forget to push the ejector down before try to move slide foreward.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Yellow Quote  Post ReplyReply Direct Link To This Post Posted: 15 Feb 2024 at 5:03pm
Oh yes, I must have made a mistake converting from inches to mm. I’m sorry Embarrassed

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Post Options Post Options   Thanks (0) Thanks(0)   Quote OneWay Quote  Post ReplyReply Direct Link To This Post Posted: 15 Feb 2024 at 8:11pm
Originally posted by Luc V. Luc V. wrote:

To oneway, the difficulty in removing the slide off the frame is most likely you forget to push the ejector down before try to move slide foreward.


Haven't been checking ejector position... I'll Keep it in mind in the future.
Thanks!

What is so damn frustrating with this AM III is, Even when you try your best that bloody hammer will eventually one-up you and come slamming down- IT IS POSSESSSED Ouch
I think I'm going to be looking for a piece of hose or a poly cap to slip over the hammer to maybe trick the bugger out when it is broken down !!

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