Robb is correct, Allem does NOT make a roller release for the Blaser. I had them install the double release back in Jan in my Blaser & thus far very happy with it. I know guys that have had McCarthy's & are also very happy. From what I understand, a bit quicker turn around with McCarthy's. For Allem's, I e-mailed & "made a reservation" for mine. When they were ready for it, I got a call from them. Shipped the reciever down & had it back in about a week or 10 days. I think I made my reservation in early or mid November. To answer your question, I am not sure if 1 is that much better than the other.