I would ONLY go with the 7.62-mini if OAL was the FIRST priority. I run a 762-RC on my LMT MWS (20" 6.5CM and 18" SS match barrels). The 762-RC sounds and performs very well with the 6.5CM. Every SF rep I have talked to has said to really avoid the mini unless you have a specific length requirement (they sound crappy with 5.56, 300blk etc.). I personally would only run one on a short AR10/SCAR-H platform, to cut down the bark, and flash. FWIW, I added a XH buffer from Clint at Heavy Buffers.com. My ejection is right at 4:30 with the 762-RC. This is exactly where brass was ejecting unsuppressed with the stock H3 buffer.
Another option is the 300 SPS. That is a touch shorter than the 762-RC and is actually quieter. I have NOT tested my 300 SPS with 6.5CM yet, but plan on very soon. I'm curious to compare the back pressure differences.
"When governments fear the people, there is liberty. When the people fear the government, there is tyranny. The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government." Thomas Jefferson.
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