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Would I need to replace just the buffer spring and buffer in order to run this in my 300 blackout, or would I need more for a smoother operation? — 1 Answer

by Eric Cramer, from OH, United States Asked on October 15, 2019

Name Faxon Firearms 5.56/300BLK Gunner Light Weight Bolt Carrier Group (4.5)
$249.00 $230.00 Save $19.00
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Answered by gibby, member, from KY, United States, on November 02, 2019

I believe you can if under-gassed. I use a SA adjustable gas block, a cheap buffer with weights removed, and a Tubb's lightweight flat wire spring with my low mass BCG in my 8.4 300blk build. You may be over-gassed w/o the adjustable gas block.

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Last updated 2025-11-12 UTC.