Series 3 Arisaka T99 ?

[Aragorn243]

Depends what you intend with restoration. There isn't anything you need to do to the rifle but there are things you can do that will not harm its value. Whether that makes it more or less collectible is debatable.

Finding the aircraft sights and installing them would be relatively easy and not expensive. Buying an original monopod for a mismatched rifle would not be cost effective but the monopod will retain its value if sold separately. Dust covers are usually serial numbered to the rifle so will not necessarily enhance it with a mismatched one but again, they will retain their value if sold separately.

For my personal purposes, I prefer my rifles to look and be equipped in the same manner as when they were used. I don't care if the parts are original or reproduction so long as they are accurate and meet original specs. To me, they are replacement parts. I put on displays and demonstrate the various rifles I own periodically and I can demonstrate a monopod, dust cover or anti-aircraft sights if my rifle is missing those items. Same with the slings. I can't really afford true collectors pieces so it makes no real difference.

You do what you like. If you are going to use it for hunting, you don't need any of the accessories. So long as you take care of it in the woods, you aren't likely to harm it. Stay away from heavy brush to avoid scratches but it is a good feeling to bring down a deer with one of these old rifles.