5.) H3 5.5oz + Extra Power Buffer Spring (Red)

Sprinco Extra Power Carbine Spring (Red) W/ BKF H3 Buffer (5.5oz)
(The option with the most spring tension, this spring is suited for SBR’s and Pistol’s with excessive bolt speeds. This spring is suitable for 7.5″-8″ 5.56 uppers with Pistol length gas systems (which are typically way over gassed) Some suppressors with extreme blowback and 9mm conversions.)

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