A few questions: ---Replied with answers.
- What do I need to get started, as in, what parts should I inspect and what am I looking for? Do I need to buy any gauges? --Reply: Go to this site and read everything: http://www.civilianmarksmanship.com/ As for tools, A lot of people get a "No Go" 30-06 headspace gauge (Preferably with clearance cutout for ejector pin) to check bolt headspace, and buy throat erosion, and muzzle wear gauges or combo gauge to check the wear and condition of the barrel at the throat and muzzle. Some people like to buy one of the old USG M1 combo tools and keep it in the buttstock, along with the actual USGI cleaning kit items. You will need the USGI combo tool or aftermarket tool to remove the gas cylinder screw, which is the lead item in disassembling the front components on the barrel. In a pinch a very large flat blade screwdriver can be used, but is more likely to bugger up the cross slot in the gas cylinder screw.
- What are the most common rookie mistakes to avoid? ---Reply: (1) Do not shoot any old 30-06 ammo in the rifle, especially do not use modern higher powered hunting rounds, damage can result. Also, learn to load the clip by pushing the clip down while keeping the side of your hand firmly against the op-rod handle. When the clip locks in the bolt may/will try to slam home and catch your thumb in it. And when pulling your hand away rotate the hand and fingers forward and up, not straight up. This lessens the change of bolt bite, known as "M1 Thumb".
- Is S&B and Prvi M1 ammo still GTG? ----Reply Yes, Both are fine. Greek HXP ammo is fine too, but its dirty, (Not corrosive) and results in more cleaning effort. Old surplus Danish Garand ammo is usually good too. South Korean surplus ammo is a mixed bag, IE: KA series is corrosive and has had some bad failures, PS series is non corrosive, but certain lots have been known to have bad failures, other lots have shot fine.
- What's the best source for parts (I read the sticky, just looking for one place that has most of what I'll need)? ---Reply: Several Good Sources: Ammogarand.com, M1garand.com, Dupagetrading.com, Amherstdepot.com, and other private sellers. Sign up on the CMP forums, lots of private sellers there. The CMP sells some refinished USGI parts in their Estore. You can also try Sherluk.com for parts. Fulton Armory offers some good repro parts too. There are some other vendors that can be hit or miss.
- What's the best source for USGI clips? ----Reply: See above. and see what is offered by the CMP or by members on the CMP Forum.
- Anything else? --Reply: Check the recoil spring that is inside the op rod tube: If it is less than 19 1/4" long, has kinks or distortions in it, broken, or the round wire has flats on the outside replace it. M1Garand.com offers a high quality replacement. Also, check your rear sight, does it move cleanly, does the elevation knob make nice clean clicks when adjusted, does the windage knob have enough tension to keep it in place when you make click adjustments. If not you may need a new part or two. Also, by design, there is supposed to be a little bit of looseness in the front (forward) handguard. Don't try to tighten it to rigidity. The wood parts should be lightly cleaned and re-oiled periodically, and there are multiple methods for this, so read up and pick your poison.
HTH