Reddit mentions of OneTigris 6" Foldable Half Face Mesh Mask Military Style Comfortable Adjustable Tactical Lower Face Protective Mask (Black)

Here's what I'd go with:

Tippman Commando w/ 9.6v nimh and smart charger

Pyramex I-force and One Tigris mask (With ear protection)

There are plenty of other variations of these as well. Classic Army, G&G, and ICS make great M4s. CYMA makes great AKs. You could use a lipo instead of a nimh which requires a bit more care but work better and are smaller.

For eye protection you could get surplus ESS NVGs or Revision Desert Locusts

for face protection you could get a standard full metal mesh mask or a steel mouth (which I use)

Gun:
G&G CM16 is solid. It has rails, is pretty light, and is suitable for CQB. Get him a couple of hi-cap magazines, 9.6v butterfly battery and smart charger to go with it and he's set gun wise.

Eye and Face pro:
I really like my Pyramex I-Force, never fog, low-profile, and meet the ANZI impact requirements so his eyes will be safe. The OneTigris mesh mask is really comfortable and will protect his face and more importantly his teeth. There are some that clip onto FAST and BMP helmets as well. Small version and one with ear-pro attached.

Honestly if he holds the barrel, there's no need to spend money on a grip, you can always go back and buy it later if he wants it. Same goes for the other equipment and attachments, stick with the basics and make sure he likes it before heavily investing.
A lot of people stand by Just Airsoft Ammo for BBs. Only use .2g BBs at the minimum. .12s and cheap BBs will mess up the gun's internals and may shatter on impact, potentially seriously injuring the person who was shot.

Pyramex I-Force are very popular goggles. I believe OneTigris mesh masks are the most popular mesh lower. Also available without ear protection if you prefer that, though I think most would suggest going with ear protection built in.

The battery type in that gun is a 'nunchuck' type which exists out of 2 stick batteries wired together. Extra magazines depends on where you play and how trigger happy you would be:

• Fast play, Lots of shooting, 1h+ matches, get 1 or 2 extra Hi-Cap magazines (They contain more BB's (200+) and you have to wind them with the small rotor on the bottom of the magazine).
  
  
• Slower play, Milsim-like (I wouldn't advise this as your first experience in airsoft but I'll add it anyways, get a bunch of Mid caps (70-180 BB's) and a speedloader to fill them up as they don't make sound they could be useful for more sneaky gameplay.
  
  
• CQB, 20 min games, just use the Hi-Cap magazine you got with your gun, will be plenty of BB's for you to start with until you have chosen what you really want.
  
  If I'd be you, I'd just get the gun with a nunchuck battery (9.6V NimH or 7.4 Li-PO) (fits in the stock of the gun) and a decent smartcharger. Play some matches in your local fields (make sure you have some fields near you before you buy anything) and search for your favorite field and adapt your gear towards that.
  
  Accessories aren't a must have, but a nice grip (I prefer an angled one) could give you some good comfort. Also a simple sling will save you from dropping your gun by accident. A scope again depends on the environment you play in, if it's CQB get an open reflex sight it makes aiming so easy. If it's outdoor, get a red dot which could have magnification (prices go up very quickly!). Flashlights are useful but expensive, laser sights are forbidden in some countries like mine.
  
  But most importantly, get some good eye/face protection, some which have been repeatedly advised:
  
  
• https://www.amazon.com/Pyramex-I-Force-Sporty-Anti-Fog-Goggle/dp/B01GOR9756
  
  
• Dye i4 for full face protection (I have this one in particular and it never fogs on me, It's just great, just doesn't give you the realistic look some people are looking for. But it is great especially in CQB situations
  
  
• Revision desert locust for eye protection, I heard these are great against fogging up, they will cost you big aswell though if I am not mistaken (correct me If I'm wrong) as these are military goggles.
  
  
• A simple half-face mesh mask to go together with one of the 2 eye-protection suggestions:
  https://www.amazon.com/OneTigris-Comfortable-Adjustable-Protective-Available/dp/B01KT0HEW2/ref=sr_1_1?s=sporting-goods&ie=UTF8&qid=1483779165&sr=1-1&keywords=onetigris+half+mask
  
  Don't go about and buy plate carriers / camo before you know what you actually want, this sport is a money drain, use your money whise is my last advise.
  

If you don't even go through one of those mags in a day is it really necessary for you to get a vest? Or is it just for looks? Either way, I don't think it's super necessary unless you're planning on getting a bunch of midcaps and carrying those instead.

As for the mouth mesh, have you tried cutting it to conform your face/goggles? Otherwise you could try this OneTigris half mesh. Doesn't really cover your lower jaw line but it protects your teeth perfectly.

The onetigris mask is metal mesh in the middle, but also a kind of cloth-foam composite that covers your cheeks. It's flexible and basically doesn't need to be molded, just don it and go.

I presume you haven't heard of this and have so far only used "all-metal" mesh masks. This is the mask that was recommended.

I personally use a slightly modified version, and have can get proper sight picture with M16A2 irons.

Alright, based off what you said here's what I have:

Gun: http://www.evike.com/products/66458/

Mag: http://www.evike.com/products/25404/

Mask: https://www.amazon.com/gp/aw/d/B01KT0HEW2/ref=ox_sc_act_image_1?smid=A61NV174423ZK&psc=1

Goggles: https://www.amazon.com/gp/aw/d/B006WPSDXS/ref=ox_sc_act_image_2?smid=ATVPDKIKX0DER&psc=1

Bbs: http://www.evike.com/products/67703/

Just wondering, is there any good, cheap sight that you could recommend for the gun?

https://www.amazon.com/OneTigris-Comfortable-Adjustable-Protective-Available/dp/B01KT0HEW2?th=1

I put the !OneTigris mask back into my cart (just to make sure I have the right one, I linked it). And those goggles are really expensive, just making sure, someone said !these goggles are also good for protection. What do you think?