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benelli m4 SBS spring length

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i am trying to plan an M4 SBS project but had one question in my mind that i couldnt seem to find the proper answer for on google.

 

if i throw a 14" factory barrel onto my M4...to what length do i need to cut the factory spring to for reliable feeding?

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The M4 14" & std. 18.5" use the same magazine spring as the magazine tube length & capacity are the same, only the barrel changes.

Edited by benelliwerkes

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The M4 14" & std. 18.5" use the same magazine spring as the magazine tube length & capacity are the same, only the barrel changes.

 

I compared the stock spring that come standard with the 5 round round magazines to the original m4 spring and they are 3" in length difference.

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I compared the stock spring that come standard with the 5 round round magazines to the original m4 spring and they are 3" in length difference.

 

are you referring to the 14" sbs anywhere in your statement?

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are you referring to the 14" sbs anywhere in your statement?

The 5 round Benelli m4 spring works with the 14" 5 round magazine tube.

The standard Benelli M4 7 round spring is longer by 3" than the stock 5 round spring however both work on the 18.5" magazine tube.

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I compared the stock spring that come standard with the 5 round round magazines to the original m4 spring and they are 3" in length difference.

 

 

The OEM springs take a set VERY fast (as in, after a few loadings, you lose a few inches).

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