If you're not scoping it, just slap a USGI stock on it and be done.
Here's what I've done to mine so far:
*Re-aligned op-rod guide, falls now at 25-30 degree angle instead of 45 and lines up with gas piston.
*Peened gas system to eliminate play.
*Had side mount screw re-tapped to 1/4inch for scope stability.
*Dry cycled action a few hundred times to smooth out trigger
*Replaced stock with USGI fiberglass.
*Harris bipod.
I'm into this gun now for under $700.00 without the scope. I tightened up the gas system and aligned the op rod guide myself. I had a gunsmith check the tolerances of the gun and re-drill my side mount (it wasn't standard to begin with, some chinese metric I think).
Here's what I paid:
* Gunsmith inspection and side mount drilling $60
* USGI stock $125
* Harris bipod $100
* Leapers scope mount $60
* 2007 m305 $399
* Match Op rod spring guide $30
=$774 total
It was shooting 1.5 inches @ 100y before the spring guide, gas assembly tightening, op rod guide alignment, and USGI stock. I'm hoping these mods will bring it down a bit. The gunsmith said the trigger on my gun is really good, and had me compare mine to a few of his. I think he's right, it's very smooth compared to other norincos and springfields.
We'll see how it shoots next weekend. I'm going to spend tomorrow making ammo for the thing.