PCFIVEZ Posted March 9, 2017 Share Posted March 9, 2017 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? Quote Link to comment Share on other sites More sharing options...
benelliwerkes Posted March 9, 2017 Share Posted March 9, 2017 (edited) 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 March 9, 2017 by benelliwerkes Quote Link to comment Share on other sites More sharing options...
Unobtanium Posted March 9, 2017 Share Posted March 9, 2017 You dont. Same spring. Quote Link to comment Share on other sites More sharing options...
PCFIVEZ Posted March 9, 2017 Author Share Posted March 9, 2017 great news! thank you guys! Quote Link to comment Share on other sites More sharing options...
heckler&kochp2000 Posted March 15, 2017 Share Posted March 15, 2017 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. Quote Link to comment Share on other sites More sharing options...
PCFIVEZ Posted March 15, 2017 Author Share Posted March 15, 2017 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? Quote Link to comment Share on other sites More sharing options...
benelliwerkes Posted March 16, 2017 Share Posted March 16, 2017 Quote Link to comment Share on other sites More sharing options...
PCFIVEZ Posted March 16, 2017 Author Share Posted March 16, 2017 thank you. Quote Link to comment Share on other sites More sharing options...
heckler&kochp2000 Posted March 17, 2017 Share Posted March 17, 2017 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. Quote Link to comment Share on other sites More sharing options...
Unobtanium Posted March 17, 2017 Share Posted March 17, 2017 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). Quote Link to comment Share on other sites More sharing options...
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