Just talked with FOUNDATION today. TL3 and Impact are mostly interchangeable, the radius on actions are the same. Lone peak is totally different and rim x bolt handel is swept so very different as well, this one looks like 737 impact as it has the cut near the bolt release. I have put my lone peak in my TL3 and it shoots great but it's not a perfect fit as far as contact points under action. Hope this helps.