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4/4/2009 7:28:40 PM EDT
I have a new Bushmaster M4/A3... according to document I found on this site, Bushmasters do NOT use the heavy duty buffer spring.  Should I put on in?  I expect a fairly low round count relative to what I see here.... i.e. probably 500-750 rounds per year (I have several AR's).

I am going to gun show tomorrow, if I should get a heavy duty spring, are there any "gotchas" or should I just look for a standard carbine heavy duty spring.....
4/5/2009 3:12:50 AM EDT
[#1]
If you are referring to the action spring (many folks call it a buffer spring), then no, use the factory spring.  You’re more likely to create a problem where none existed, especially with lighter loads. .  
For reference the action spring is listed as #1 here.  
4/5/2009 4:57:35 AM EDT
[#2]
Quoted:
I have a new Bushmaster M4/A3... according to document I found on this site, Bushmasters do NOT use the heavy duty buffer spring.  Should I put on in?  I expect a fairly low round count relative to what I see here.... i.e. probably 500-750 rounds per year (I have several AR's).

I am going to gun show tomorrow, if I should get a heavy duty spring, are there any "gotchas" or should I just look for a standard carbine heavy duty spring.....


First and foremost SHOOT THE GUN in the factory configuration before you make any changes. Very simply...."If it aint broke"!!!

tex45acp
4/5/2009 6:18:46 AM EDT
[#3]
Oh... I thought the reason for the heavier spring was to help protect the bolt and carrier from a beating at the higher pressures seen in the carbine... i.e. ya, it works with the factory spring, but a heavier spring helps reliability and longevity.... no?
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