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Discussion in 'Gun Building, Modifications & Repairs' started by Ian5538, Oct 16, 2012.
For my m4 I need good length tbb I should get 509mm etc. and good hop up for long range engaments
A 455-509mm Prometheus inner barrel, Prometheus hop-up chamber and the proper cylinder (type 0) would perform very well. You could also look into one of the popular hop-up mods such as an r-hop or flat hop for better performance.
What about the hop up itself
Prometheus chamber, bucking of your choice (plenty out there but i prefer systema), and check these threads out:
We need to know what gun you are using before I can tell you length, but a madbull 6.03 with systema bucking and stock hopup Chamber will perform well.