if your shooting Std Velocity ammo you don't even need the buffer. There are several over there that have worn out the spacer and shoot on with the SV ammo. Several off and on have mentioned several thousand rounds and on guys that tracks that info for his guns for whatever reason stated about 10,000 rounds (I don't remember exact amount) with only recoil spring having been replaced. The 422, 622, 2206 and 41 don't have the buffers and those guys shooting in match's shoot several thousand rounds a year.

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Cranky Old Retired USN Guy