Standard 115g Winchester and 90g Winchester Superclean (147g Winchester WinClean looks the same but is more accurate). My brass has always been "dirty" in the 9mm AR using regular 115g or 124g. The rifle is a Colt 6450, 22 years old, all original parts but less than 10000 rounds. My guess is about 6000, most of that mine the last 5 years. Prior to that it sat in a safe at my brother's, who purchased it new and rarely shot it.
Is this degree of burn normal for the 9mm blowback platform? Note the one split case... It's been suggested I go with a a) longer spring such as one from a .308 and/or b) restrict buffer travel with quarters or spacer and/or c) heavier buffer (I THINK my stock buffer weight is 5.5oz but I can't seem to find a reference to verify that).
Thoughts?
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