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I've been a huge fan of the SJC Titan comp and I had one spare.
I do bring some in every so often, but they tend to sell before ever making it onto CGN. They are basically the most effective comp out there if you can stand the concussion and noise. I've singed off knuckle hairs before when shooting my AR side prone under a VTAC barrier because of the gas coming out the side. But Damn is it effective