Those National Match Medals and photos are awesome.  That Rifle brass muzzle cap/front sight protector must have been stretched (reformed) to fit.  The rear 'peep' sight is a 'no-drill' Pacific and fortunately caused no permanent alteration to the carbine.  You should obtain a correct cut-off just to have one.  A picture of the muzzle with the cover off, would be nice to see.  (photo of Pacific sights attached).

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