FX Impact barrel thumb screw quick mod.

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Jack.K

Jack.K

Member
Oct 12, 2015
747
138
San Francisco , California
Here is a quick tip for Impact owners with barrel locking screw issues. My impact shoots great after the initial leak problem. I have put over 2000 JSBs through its barrels. I love the gun but the thumb screw backs out after shooting a few magazines. Since the gun has lots or o-rings why not add another one. LOL
I installed an o-ring over the barrel locking screw. It gave just enough rubber berween knob and the block I didn’t wanted to use thread lock since I have multiple caliber barrels. The o-ring I used were 10mm x 5mm x 2.5mm. This worked very well for me. Quick and cheap fix.
 
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Does it keep the screw pressure all the way to the barrel avoiding the thumb screw to unscrew? That little amount of rubber (2mm flat, after pressure perhaps) does not interfere between the thumb screw and block avoiding full contact of the screw into the barrel indicator hole? How many shots have you try so far? I am not doubting... Just going a little deeper. Nice mod for sure. 
 
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"Paio"Does it keep the screw pressure all the way to the barrel avoiding the thumb screw to unscrew? That little amount of rubber (2mm flat, after pressure perhaps) does not interfere between the thumb screw and block avoiding full contact of the screw into the barrel indicator hole? How many shots have you try so far? I am not doubting... Just going a little deeper. Nice mod for sure.
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The o-ring got compressed to about 1.75mm from 2.5mm when it's pressed against the receiver block. On my Impact this simple mod is keeping the screw from unscrewing out even after about 100 shoots. I placed a blue tape arrow pointing to my barrel as my reference to before the o-ring and after the o-ring. This also lets me know if the screw has moved or not. I think the that o-ring pressure is helping to keep the screw from "vibrating" out. 





 
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Jack.K
"Verve"Going to give this a try as its probably the simplest solution to the problem.
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@Verve
How did it work for you?

its been a month since I did this mod on my Impact and the barrel thumb screw is still locked in after another tin of JSB. 
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Hi Jack
Thanks for the reminder. O-rings is on order now, when delivered will try it. Been busy with custom shroud so not really paid attention to this.
 
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