The Williams FoolProof (FP) peeps that will fit your rifle are the FP-98, or the FP-98-TK, which has large target knobs for adjusting w/e ILO a screwdriver slot, which is (of course) "fool proof".
Likewise, Lyman makes their 57 peep either with or w/o target knobs - being the 57SME ("hunter's" knobs) or the 57SMET, which is the target knob model.
Of course, if your rifle isn't factory prepped for a peep, i.e. drilled/tapped, the receiver bridge will need two holes D/T in it's side for either.
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