Hello all...I have a question about how determental is using a suppressor on a 7.5 in" barrel M-4. From what I understand Yankee Hill wont warrenty it. I can accept that, but is that something really to worry about. Question two...From what I understand one reason for this maybe due to the high temp and or pressure a short barrel would generate. If so with that in mid would a Yankee Hill steel.308 suppressor handle this setup as a last chance to make this happen since I already have the .308 suppressor!...if not maybe time to buy a 10.5" SBR...Thank guys! Eugene