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Discussion Starter #1
I finely got the chance to shoot my stamped poly mak90, Loved it. I noticed before hand that the rear trunion had some impact marks. I put some tape on it to see if it was still hitting. After a few rounds I checked and still hitting. I am told this is an early mac 90, is it time for a new spring? If so any recommendations.
 

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They also make Buffers for that. not sure were to get one anymore, but i'm sure they're out there.
 

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Whats the end of your bolt carrier look like?

Start with a fresh spring.
 

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Get an Mcarbo spring. They are consistent and last longer So far every one I have checked the rate on has been consistent because they its a cold wound spring. The ALG springs I checked were not. Not by much but Id take a consistent spring of one that is not.
 

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Fig, if you get the Mcarbo spring, would you be able to do before and after spent case distance measurements? I'm very curious to see how much of a difference it makes.
 

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Discussion Starter #9
Does anyone have any concerns that the mcarbo with 15% extra power will start damaging the front trunnion?
 

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Good question just try another stock spring.
Its normal for the carrier to make contact but that seems excessive try one of these
 

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Does anyone have any concerns that the mcarbo with 15% extra power will start damaging the front trunnion?
No. That's flawed logic. Even a recoil spring that's too heavy will not cause such damage. A carrier going back too fast is what can damage the rear trunnion.
 

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Discussion Starter #12
I ordered the mcabro extra power recoil spring today. They were very quick to reply to some questions I emailed them. I will try to get back out to get some spent casing distances on the stock spring. I will get some comparison pick of both springs when it arrives and the new ejection distance.
The other mfg. has not responded to my questions.
 

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Mcarbo is a good company.
The other one is resting on it's laurels.
 

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Discussion Starter #14
Currently the Mac is ejecting casings 30 foot. More to come when the mcarbo spring arrives.
 
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