These are drop-in stocks and aren't meant to be bedded. I do have a bedded LRB and the original aerospace stock I had matched and in some cases exceeded the accuracy of my bedded birch stock. He upgraded my stock to this current stock.
Keep in mind though that with the differences in receiver geometry from receiver maker to receiver maker there may possibly be fit issues and different receivers may have different draw pressures. I do know that some SAI receivers had mysterious hump under the right side of the receivers. Those rifles that left SAI like that had material relieved from the stock to allow the receiver to sit flush with the stock. I can see where those receivers may have issues. He lives in close proximity to LRB so I would guess that he used a barrelled LRB receiver to pattern his stocks with. Regardless of what some may say, LRB's are very close to GI spec, so if the receivers are close to GI spec, they should fit in these stocks.
This particular stock has harder trigger lockup than any other configuration I have used in the past.
By the way, the whole purpose of him using this composite make-up was to have the strength of heavy fiberglass without the weight which is why he is staying away from fiberglass. I'll see if I can get him to post on this site. Other than that, just e-mail him with questions.