ALCON,
Here is the link to the thread that answers most questions, with additional links to the pages on my website that answers more.
Troy and Sage threadHowever, I need to clarify a few things.
1) The Troy IS NOT permanently modified as the receiver is not modified. The oprod has has an additional point of contact welded in, but if you wished you can reverse the SOPMOD conversion by replacing the barrel, oprod and stock; it's that simple.
2) The Sage is not a true drop-in. It requires removal of the gas system and replacing of the oprod guide. Less parts changing than the Troy Rock SOPMOD, but the stock weighs much more than Troy's, and you can't put an over the barrel suppresor on a 16" barreled Sage-stocked rifle; you can with Troy's.
3) Troy is producing the M-14 Modular Stock System that will be much like his Rock SOPMOD M-14 that will drop-in.
4) $3600 is not out of the ball park for a hand assembled 7.62 designated marksman rifle. It just does not look like one.
I hope this helps.
Take Care,
Tony