No 4 Mk1 Trials Rifle Rear Sight Plunger & Spring

[waco16]

Are they so different from the No 4?

Very different
Trials rifle rear sights had circular cutouts for a ball detent for the raised and lowered positions

Std production No4 sights had flats that rested on the familiar spring loaded 'top hat'

Information

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[browningautorifle]

Very different

No matter how I looked I couldn't find detail on them... The standard sights I have...