The front-sight Pin is slightly tapered and should be driven from left to right.

Pin diameter is approximately .061 to .063".

Pin length is approximately .248 to .255".

A 'drift punch' tip area should be .060" or less in diameter.

I made a 'punch' from a cheap 'all metal' Jeweler's screwdriver, by grinding the tip 'flat'.

I use a plastic or copper mallet with my improvised 'punch'. Barrel and sight-base are supported on a wood block with a hole for Pin to move into.

(I lay the barreled-action on a bench, resting on the flat side of the magazine-gate. The barrel-muzzle is supported by the wood block and is relatively level).

It does not require much force. The Pin is relatively soft.