I have one of the Springfield Armory Inc. Garands, serial number that's in the 7,000,000 range. The receiver is marked "U.S. Rifle / Cal .30 M1 / Springfield Armory / <serial number>" There is no indication of "Inc." on this one.
It has one of the cast Australian receivers, not a forged one like an original, so there is no doubt that it's a copy.
It has a Boyd's stock (judging by the thickness of the grip) and a new barrel. The rest of the parts are GI, not Springfield Armory Inc. manufacture.
Yes, I put an Amega Ranges mini scout mount on it. I understand Fulton Armory and CMP both sell the same item, but CMP has their name on theirs. I saved the rear handguard so I can restore it to "original", but as it has NM sights, I can't use it for JC Garand matches anyway. It's just for fun.
The Eotech sight has a 1 MOA dot and works quite well at 200 yds. It comes off easily and has good return-to-zero. The iron sights are visible down the groove in the mini scout mount.
Also, the muzzle brake does significantly cut recoil, and is also reversible. It just replaces the standard gas cylinder lock.
What isn't visible is the adjustable gas plug. This lets you use standard or reloaded .30-06 ammunition in a Garand without bending the op rod. (You start with it wide open, then adjust smaller until the rifle just functions reliably. You need to do this every time you change loads.)
Right now, CMP has surplus Greek .30-06 ammo that is safe for Garands. It's available in 20 rd boxes or 8 rd clips. Price is good, for now, but demand is up. If you are going to shoot your Garand a lot, you might get a couple cases.
Here's a useful link that shows how to field strip a Garand:
http://www.surplusrifle.com/garand/rifledisassembly/index.asp
Replacement stocks for Garands are available, but as the dimensions affect trigger group functioning, "do-it-yourself" can be tricky. Dean's Guns Restorations has really nice stocks available in a variety of woods, or laminated, which make a Garand look like a show car. I left mine in walnut, and am working on building a set of nicks and dings such as your original probably has. (
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Good luck with your Garand. As you have an original, I'm envious.