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Discussion Starter #1
I am just getting around to replacing the rollers in my hk91 bolt head. I see rollers advertised as +2 and +4 and I am confused.
1. What is the standard size of the rollers?
2. Should I buy +2 and +4?
Thanks in advance.
 

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I am just getting around to replacing the rollers in my hk91 bolt head. I see rollers advertised as +2 and +4 and I am confused.
1. What is the standard size of the rollers?
2. Should I buy +2 and +4?
Thanks in advance.
are you sure you need to..dont fix it it it's not broke.
 

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Discussion Starter #5
Well I am getting some pretty violent recoil, blown primers, failure to eject/extract. It is nasty. So I thought I would start with the rollers and work up.
 

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You should check teh bolt gap. The instructions are in the link I provided above. It sounds like your bolt gap has closed to below spec.
 

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always CHECK THE BOLT GAP! before you start playing with it!!

could be you have some crummy ammo... ya never know..

as most true Hk91's will last a life time and never need new rollers...(unless your shooting 40.000rds a year)

just a note
 
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