▁History ▁Smith ▁& ▁W ess on ▁( S & W ) ▁began ▁experiments ▁with ▁. 4 5 ▁A CP - f iring ▁p ist ols ▁in ▁ 1 9 8 4 , ▁and ▁produced ▁their ▁first ▁one , ▁the ▁Model ▁ 6 4 5 , ▁in ▁ 1 9 8 5 . ▁Public ▁demand ▁led ▁to ▁the ▁development ▁of ▁this ▁series . ▁ ▁The ▁series ▁is ▁a ▁. 4 5 ▁A CP ▁version ▁of ▁their ▁ 9 mm ▁Par ab ell um ▁weapons . ▁ ▁They ▁are ▁normally ▁double - action ▁weapons , ▁or ▁what ▁Smith ▁& ▁W ess on ▁refers ▁to ▁as ▁a ▁traditional ▁double ▁action . ▁They ▁generally ▁have ▁a ▁bar rel ▁b ushing ▁press ▁fitted ▁into ▁the ▁m uzz le ▁end ▁of ▁the ▁slide ▁instead ▁of ▁a ▁separate ▁bar rel ▁b ushing ▁like ▁a ▁ 1 9 1 1 ▁p istol . ▁Like ▁many ▁Smith ▁& ▁W ess on ▁models , ▁each ▁variant ▁was ▁generally ▁in ▁production ▁for ▁only ▁a ▁few ▁years . ▁ ▁The ▁Model ▁ 6 4 5 ▁was ▁introduced ▁in ▁ 1 9 8 5 , ▁and ▁produced ▁until ▁ 1 9 8 8 . ▁ ▁It ▁has ▁a ▁st ain less ▁steel ▁frame ▁and ▁slide , ▁an ▁amb ide xt r ous ▁safety / de co cker , ▁a ▁squ ared ▁trigger ▁guard , ▁and ▁black ▁pl astic ▁g rip ▁pl ates . ▁ ▁The ▁Model ▁ 7 4 5 , ▁built ▁from ▁ 1 9 8 6 - 1 9 9 0 , ▁was ▁a