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Discussion Starter #1 (Edited)
So I was swapping around my unused PTR stock and my Hk SG1 stock(with heavy buffer) and I noticed something that seems a little off. The SG1 stock recoil spring seems to be lighter than the new PTR stock one. Atleast by a few pounds because its really noticeable when charging the weapon. Do these recoil springs go bad? And would a lighter tension spring have an adverse affect on a new roller lock weapon system, or recoil? If so how does one replace the spring.

Thanks all!
 

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Discussion Starter #2 (Edited)
Anyone? is there a set weight/tension that the spring should be at?
 

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Discussion Starter #4
U.S. I have springs on some of my stocks that are over 30 years old and they still work fine yes they can be replaced. (drive out the small pin behind the nylon O Ring) In this case forget about your PTR stock spring its fine.

As far as the SG1 spring goes I have no idea, I don't use them.

G3 HK91 Recoil Assembly, Recoil Spring, Guide Rod HK 91 PTR91, RTG Gun Parts

HDH.
Oh I'm sure the PTR spring is perfectly fine, its new outa the box. The SG1 stock however I picked up used so when I felt the spring difference between the two it interested me. They both use the same spring and washer. I tried to tap the pins out with a punch and small hammer to swap the springs from one to the other but neither the pins in the PTR stock or the SG1 stock want to move. Is that normal or are they supposed to be able to be removed easily?
 

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Discussion Starter #5
So I spent the day at the range yesterday, swapping around both stocks and seeing how recoil differed. To my big surprise it actually feels like the PTR stock with its standard buffer and its hard rubber pad had a little less felt recoil than the SG1 stock with its heavy buffer and heavy rubber but pad (although the ptr stock is too short for me so hits me in the cheek when it recoils so I still need the longer sg1 stock)

Would a spring weight have that big a difference on how the rifle recoils? Is it possible for a heavy buffer to go bad? Most people I hear talking about heavy buffers say they cut recoil substantially, but it almost feels the same or worse than the ptr standard buffer stock.
 

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I would put a new spring on it, and then see what it feels like. If the spring is weak,then the heavy buffer may not be working as it should be.Some ammo has different felt recoil also. I noticed the british radway green is very soft compared to other nato ball or match for that matter. Just m.o.
 

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Discussion Starter #7
I hope that will solve the issue

so I'm playing with the buffer right now. Is the outer collar of the buffer supposed to be 10X harder to push in than the center rod?
How does one even remove the buffer on a SG1 stock? I took out the two screws but it still wont budge.
 

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The butt cap has to be rocked off in a vice ,as not to crack it.be easy with it. There should be a flat head screw holding the buffer in from the inside of stock. Use flash light to see it. It may not have the screw.If there is no rear screw,The SLEEVE around the buffer hole may be tight and crusty, Should be a screw thru the back though. let us know.Butt cap is just clipped on the the 2 pin holder sleeves at rear of butt.You may have one that was installed with out the rear screw.HKparts sais its not needed. I like to use them if i can find the screw size.
 
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