Bluedreaux, Mine is the OR version. What is the concern over the buffer? Did some come with the wrong one? Will it hurt it? Seems to work fine but I'm no expert. I have less than 500 rounds through it so maybe it's ok? Someone also mentioned them being over gassed. What does that mean?
The whole system works off of gas pressure coming from the fired cartridge. The gas flows from a hole in the barrel (the gas port) through the gas block, down the gas tube and into the bolt carrier group...causing the action to cycle. The gas flows through the gas block like that until the bullet leaves the barrel and all the gas escapes out of the muzzle. If the BCG is getting too much gas it's typically called "over-gassed". This can be caused by a gas port that's too large, gas systems (like yours) that are short and close to the chamber where gas pressure is very high and barrels that are too long for the gas system (because the gas is being fed to the chamber for a longer amount of time until the bullet leaves the barrel).
The concern is that there's too much gas going to bolt carrier group. This can cause failures to extract, wear on the bolt, and excessive recoil. Manufacturers sometimes purposely make their ARs slightly over gassed to make sure that the gun will function with any ammo you feed it, from high powered 5.56 to super weak foreign .223. They figure that as long as the gun goes bang the customer will be happy and the benefit of over gassing (reliability with weak ammo) is worth the cost (potential malfunctions). If you're not having any malfunctions and this isn't an people-shooter, then I wouldn't worry about it too much unless you just want to tinker with it.
From what I've read and my sample of two, the S&W carbines are pretty gassy. I put a heavier buffer in one and it made a significant difference for me. The heavier buffer will add more resistance to the BCG (which is getting too much gas pushing it back) and slow it down some. I think S&W carbines are shipping with carbine weight buffers. Open up the upper / lower and look at the buffer. If it's blank, it's likely a carbine weight buffer. H or H2 buffers will be stamped accordingly.
If you feel like tinkering, get an H or H2 buffer and try it out. Shoot the carbine and H2 back to back and I think you'll notice a difference. ARs don't really "recoil" that much. But if you try the different buffers while shooting offhand at 75 yards or so you'll probably see that your sights move less. If you're not shooting offhand at those distances or you rarely have to make a lot of multiple shots or target transitions, the benefits may not be worth the hassle to you.
But it won't hurt anything to try it. If you switch to a heavier buffer, load a mag with the weakest ammo you shoot. Make sure the BCG is cycling far enough back to reliably feed rounds from the mag. Also make sure you try just loading one round in the mag to be sure that the bolt will lock back on an empty magazine. If it doesn't, the buffer is probably too heavy and is keeping the BCG from moving far enough to the rear and you'll need to move to a lighter buffer. But if you're shooting American made commercially loaded .223 or 5.56 ammo I think you'd be fine with going straight to an H2.