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What buffer spring comes in it
4 Answers

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Hi Tara and welcome. It uses the BFSIII® Carbine Buffer Spring here: https://franklinarmory.com/shop/binary-triggers/bfsiii-parts/bfsiii-carbine-buffer-springs/ ----- Cheers, stay safe and enjoy!
This below...
The BFSIII® Carbine Buffer Spring is an increased power buffer spring that is useful for tuning a BFSIII® equipped firearm. Since gas system lengths, pressures, and other variables may change the way your firearm functions, we cannot guarantee that this spring will work in every application. Franklin Armory recommends consulting with a professional gunsmith that is familiar with the AR platform for help with tuning your firearm.
Hi Terra, this comes with a carbine length buffer spring.
Stay safe & have a great day!
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. It uses the BFSIII® Carbine Buffer Spring