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Recoil rods shooting loose

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Category: Auto Mag Pistol
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URL: http://www.amtguns.info/forum_posts.asp?TID=2428
Printed Date: 18 Apr 2019 at 9:24pm
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Topic: Recoil rods shooting loose
Posted By: Pantera Mike
Subject: Recoil rods shooting loose
Date Posted: 29 Oct 2018 at 5:47am
Even though I just changed the helicoils, my recoil rods keep shooting loose. I find that after only 8-10 rounds, I have to tighten them anywhere from 1/8 to 1/4 turn, making them as tight as I dare. Surely this can’t be normal? Since the helicoils are brand new, and the locking variety to boot, does this suggest my recoil rods themselves are worn out?



Replies:
Posted By: desertmoon
Date Posted: 30 Oct 2018 at 4:17am
Originally posted by Pantera Mike Pantera Mike wrote:

Even though I just changed the helicoils, my recoil rods keep shooting loose. I find that after only 8-10 rounds, I have to tighten them anywhere from 1/8 to 1/4 turn, making them as tight as I dare. Surely this can’t be normal? Since the helicoils are brand new, and the locking variety to boot, does this suggest my recoil rods themselves are worn out?


I would say yes.  I am running one of the new guns and I just ran 250 rounds STRAIGHT the other night and I didn't have to tighten my rods at all....but give it another couple of years of shooting and cleaning and I bet I get there.

On my new gun, as you get the threaded portion deeper into the helicoil, the threads get progressively tighter and are nearly locking up/galling on the last turn or two....which is exactly what I want.


Posted By: Pantera Mike
Date Posted: 21 Feb 2019 at 5:06am
So I took my new-to-me 357 Auto Mag to the range for the first time and fired 50 rounds, and the recoil rods stayed completely tight. Although I didn’t bring my other one with me, I’m confident I would have had to tighten them after each magazine. 

New recoil rods time for my first one?


Posted By: Luvz2Shoot
Date Posted: 21 Feb 2019 at 2:12pm
Did you replace the heli coils in your cocking piece, in your first AM?

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If you were happy and you knew it, would you clap your hands?


Posted By: Pantera Mike
Date Posted: 21 Feb 2019 at 10:02pm
Originally posted by Luvz2Shoot Luvz2Shoot wrote:

Did you replace the heli coils in your cocking piece, in your first AM?

Yup. 

http://www.amtguns.info/how-to-change-helicoils_topic2324.html" rel="nofollow - http://www.amtguns.info/how-to-change-helicoils_topic2324.html


Posted By: Pantera Mike
Date Posted: 23 Feb 2019 at 4:23am
I am going to give Patrick another try.  I will call Monday and see if I can get a set of recoil rods.  I hope they answer the phone....


Posted By: Pantera Mike
Date Posted: 27 Feb 2019 at 7:13pm
New Auto Mag was extremely responsive, called me back twice and quickly sorted me out.  I have two new recoil rods and flat ground Wolff springs enroute. 

Patrick sent me a couple of interesting videos. They built a fixture to study the behavior of the recoil springs under compression and extension. They placed a large cylinderical weight over a spring on a rod, compressed it, then gently let go. As the standard spring expanded, it rotated the weight 1/4 turn. As the new spring expanded, the weight didn’t rotate. 

While that's all well and good and represents an improvement, the thought occurred to me that the behavior of the stock springs could have been exploited by simply winding them in the opposite direction. They would then have had the effect of constantly applying a slight tightening force each time the gun was fired. The new springs are apparently much better than the old ones because they behave in a benign fashion. But one can imagine how helpful it might be to have the gun constantly working to put itself together, rather than take itself apart.....



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