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A thought on your Suppressor choice:
Choose a Can that is tough and tested. At 11 inch barrel length you are dealing with high pressures. The Mk18 Mod 0/1 and the COLT M4CQBR at 10.3/10.5 start to push the limits of pressure on the blast baffle of a Can. Putting cans on anything shorter than 10.3/10.5 (e.g. 7.5inch VSBR's) is really pushing your luck on the life of the Can. (This pressure curve is also highly variable based on caliber.)
What happens is that the constant pounding of that pressure on the blast baffle and first few baffles causes erosion to the interior of the Can. Because the powder does not have a complete burn, it is in essence a sand blaster, throwing that powder against the baffles and slowly cutting away on them. If you do not plan to shoot it a lot, you should be alright. It is just some other factors to consider.
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