You could have asked me before you posted on PBN. I feel left out. To answer your question though you really have to watch not using the pin that came with the 08, but since your putting your 08 pin in your 05 you shouldn't have any problems. Just install it without the gun aired up and cycle it by hand slowely and look and listen to see/hear if there is any hang-up. If not then you could get it rubbing the top of the bolt guide causing severe anno rash or worse.
__________________ Planet Eclipse Etek w/. Star frame, 08 Ego expansion board, Etek 3 regulator, Ego10 OOPS ASA, SLS Cure 3+ bolt w/. inserts, Zick kit, Kila detents, Ego 5/6 clamping feedneck w/. Ego 11 lever and Violent thumbwheel, PE red laser eyes, Shaft 4 barrel kit w/. all backs and fronts, both Bump pistons. V3 Dye Rotor w/. Virtue board 114/4500 Carleton w/. Myth reg