Beretta 391 ?

Ok, guys been shooting my old 391 for about 3 months now, several shooters adjacent to have said some of my shells sounder "off"
1) been shooting 1 oz Italian Experiencia shells

2) I installed the "red" gas valve spring from Coles years ago , its supposed to help the gun cycle target ammo

3) since the spring is stiffer it allows more gas into the operating mechanism

Now the ?, if the spring is allowing too much gas out, could this be the cause of the off sound ?

 

The red spring is designed for lighter loads in your gun. How fast are your 1 oz shell? If around 1200, you are okay. If they are zippy Sporting loads, you should change out springs. I use the blue spring for everything in my 391.

BTW, off sounding shells are not caused by a strong relief valve spring, or a light one.

 

All my shells are under 1200

 

If your breaking the targets, maybe your shooting buddies are just trying to put doubt in your mind.

 

They don't have to "F" with my head, that's one job I'm really good at by myself

 

Changed the gas valve to the original one--big improvement, less flash & no off sounding shells--go figure

 

My Beretta 391 Spring has no COLOR, Have not fired it yet, but I notice the Spring has \been Compressed by adjusting the Notched dual 1/2nuts down on spring , What is the proper adjustment that Beretta Requires? I have no manual w/the gun.
I noticed there is a spring in the Cap also.


GB....................................DLS

 

those 1/2 washers if adjusted incorrectly could damage the 391, Beretta told me, they could not tell me the adjustment, but, I called Wally Rebesell and he said 1/8th inch from all the way down on the threads. Beretta said do not F with that spring.

GB.............................................DLS

 

I removed the "red" spring and put in the original non colored spring-seems way better, as far as the spring adjustment--there is none, tighten the long threaded tube as far as it will go and then tighten the jam nut, do not "f"with the cap as long as it compresses when u press it down

 

But you need to take the cap & spring apart occasionally to clean it so that the gas system will operate properly.

 

My son has a 391.
Beretta rep.said to put grease in the cap and screw it on.


Regards........Gerald

 

Bottom the gas valve spring all the way down, & secure it in place with the jam nut-- be sure to thoroughly clean the threads and be sure the rounded part that goes into the gas cylinder is facing up towards the barrel