Brownells.com
#178 S&W K,L,N Frame Spring Kit - Wilson Kit # 178
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From Brownells.com
High quality springs drop-in to improve handgun performance. High tensile strength wire delivers reliable function. #178 S&W K,L,N Frame - RP mainspring; RP 12, 13 & 14 lb rebound springs. Mfg: Wilson Combat SPECS: RP = Reduced Power, XP = Extra Power.