Quoted: A couple of things to keep in mind if converting your M1 to a Tanker configuration. One, your rifle will lose any collector value it has. You may also have a hard time getting out of it what you have in it, if you do decide to ever sell it. Second, several of the parts that are "modified" in order to be a Tanker are bastards. Depending on if you ever need to replace them they can be hard to find. You may also have trouble if the outfit that did the conversion later quits or goes out of business. Op rod, barrel, front handguard will all be bastards after the conversion. Also, the muzzle blast is horrific from those short barreled M1's. Just some thoughts to consider.

These are all valid points.  If the gunsmith/convertor returns all your original parts to you, you could always reverse the conversion locally, assuming a competent local 'smith.  Returning your parts might easily raise the price, though.  Best to check first.

Keep in mind that your rear sight calibrations will most likely be increasingly "low' as distance increases.  You can still get a BSZ, though.

If you ever envision tactical use, a flash suppressor is, as said above, highly recommended.  Vortex used to offer one.  Not sure if they still do.

I would think that either a Schuster or McCann device would not be needed, if the conversion was properly done.  Might be wrong, though.  Of the two, the McCann seems preferable to me.

Give some thought to what kind of stock you want, as the modified handguard will sort of lock you in, at least appearance-wise.  RamLine synthetics are decent and affordable.

All this said, the "Tanker" is lighter and much handier, though, since some weight has been removed from the front.

If you decide to go this route, I urge you to consider mounting an IER Scout scope on the thing.  You'll have to do a bit of searching for a rail/mount, though.