I have to say,I would go for the Prometheus tightbore over a Madbull any day and yeh stay away from the Systema area 1000 parts the other stuff from them is right on though!
I have the MA-56 upper for mine with Systema gears and a Prometheus tight bore thats been great for the past 4-5 years with the M120 spring.
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Death Before Dishonor" Bleeding Black Label"
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