FYI- Most 7.5's are very hard to make run right. You are really much better off with a 10.5" barrel.
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i have had some truble like this and a lighter buffer and spring fixed that gun. just did some work with a 6.8 10.3inch i went the other way used a 9mm buffer to slow it down. was hitting hard the 9mm buffer fixed it. My 5.56 10.3inch uses a lighter buffer and heavy spring. mix it up u will get it worked out.